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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Hydrogen Chloride</title>
+    <script src="chem1.js" defer></script>
+    <script src="timer.js" defer></script>
+    <meta name="Keywords" content="exercises,  balancing,  chemistry, equations, hydrogen-chloride, ammonia, nitric-acid, nitrates, sulphur-dioxide, hydrogen-sulphide, sodium-hydroxide, sulphuric-acid, preparation ">
+    <meta name="author" content="Jiban Majumdar">
+    <link rel="stylesheet" href="mystyle.css">
+</head>
+<body>
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+    <img src="myPhoto.jpg" alt="webmaster"  width="150" height="200"> <br> <a href="mailto:jibanmajumdar@gmail.com">webmaster</a>
+    </div> 
+  <table class="center">
+
+<tr>
+<td><a href="index.html">Home Page</a></td>
+<td><a href="equ.html">Elementary Equations</a></td>
+<td><a href="advanced.html">Advanced Equations</a></td>
+<td><a href="assorted.html">Assorted Equations</a></td>
+<td><a href="ammonia.html">Ammonia</a></td>
+<td><a href="chlorine.html">Chlorine</a></td>
+	
+</tr>
+<tr>
+<td><a href="nitric-acid.html">Nitric Acid</a></td>
+<td><a href="sulphur-dioxide.html">Sulphur Dioxide</a></td>
+<td><a href="hydrogen-sulphide.html">Hydrogen Sulphide</a></td>
+<td><a href="sulphuric-acid.html">Sulphuric Acid</a></td>
+<td><a href="sodium-hydroxide.html">Sodium Hydroxide</a></td>
+<td></td>
+</tr>
+</table>
+
+<h1 style="text-align:center;">Hydrogen Chloride</h1>
+
+<h2>Practise balancing equations: </h2> <h3>Direction:</h3> <ul><li>In  the following equations you will see a blank box before the symbol of each compound and element. Enter the lowest possible number in each box, or leave the box blank if you think the chemical needn't have a number (i.e. the number is equivalent to '1'). 
+<li>When you think the equation is balanced, click on the small button <span style= "color:blue;"><b>"Check answer"</b></span> that appears below it.</li> <lI>If your equation is incorrect, then click the button <span style= "color:blue;"><b> "Reset"</b></span> and try balancing the  equation again.</li> <li>In case you are in a hurry or are unable to balance, then click the button <span style= "color:blue;"><b>"Show answer."</b></span></li>
+  <li>If you want to know the time taken (minutes:seconds) to balance a chemical equation, you click the <span style="color:blue;"><b>"Start"</b></span> button and after balancing the equation, click the <span style="color:blue;"><b>"Stop"</b></span>button. Once, you have noted the time, click the <span style="color:blue;"><b>"Reset Timer"</b></span> button.
+  </li>
+</ul>
+
+ <h3>Note:</h3> If you get no response after clicking 'Check answer' or 'Show answer', your browser has disabled to run this program. Enable it by clicking below the 'address bar' and follow the instructions.
+
+<form name="equations">
+
+  <h4>Preparation of Hydrogen Chloride:</h4>
+   <ul><li>Below 200 <sup>o</sup>C, Sodium Chloride reacts with concentrated Sulphuric acid to form sodium hydrogen sulphate and Hydrogen Chloride:</li></ul>
+  <p style="font-size:115%; text-align:center;">
+  <input style="font-size: 16px; text-align: center" 
+  size=1 name=q1a> NaCl + <input  style="font-size: 16px; text-align: center" size=1 name=q1b> H<sub>2</sub>SO<sub>4</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q1c> NaHSO<sub>4</sub> + <input style="font-size: 16px; text-align: center" size=1   name=q1d > HCl</p> 
+ <p style="font-size:115%; text-align:center;"> <input onclick="check(1,'Preparation of Hydrogen Cloride',1,1,1,1,0,0,'NaCl + H<sub>2</sub>SO<sub>4</sub>','NaHSO<sub>4</sub> + HCl');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(1,'Preparation of Hydrogen Cloride',1,1,1,1,0,0,'NaCl + H<sub>2</sub>SO<sub>4</sub>','NaHSO<sub>4</sub> + HCl');" type="button" value="Show answer"></p> 
+
+ <p style="font-size:115%; text-align:center;">
+ <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer1">00:00</span>
+ <button type="button" onclick="startTimer('timer1')">Start</button>
+ <button type="button" onclick="stopTimer('timer1')">Stop</button>
+ <button type="button" onclick="resetTimer('timer1')">Reset Timer</button>
+</p>
+
+ <ul><li>Above 200 <sup>o</sup>C, Sodium Chloride reacts with concentrated Sulphuric acid to form sodium sulphate and Hydrogen Chloride:</li> </ul>
+  <p style="font-size:115%; text-align:center;">
+  <input style="font-size: 16px; text-align: center" 
+  size=1 name=q2a> NaCl + <input  style="font-size: 16px; text-align: center" size=1 name=q2b> H<sub>2</sub>SO<sub>4</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q2c> Na<sub>2</sub>SO<sub>4</sub> + <input style="font-size: 16px; text-align: center" size=1   name=q2d > HCl</p> 
+ <p style="font-size:115%; text-align:center;"> <input onclick="check(2,'Preparation of Hydrogen Cloride',2,1,1,2,0,0,'NaCl + H<sub>2</sub>SO<sub>4</sub>','NaHSO<sub>4</sub> + HCl');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(2,'Preparation of Hydrogen Cloride',1,1,1,1,0,0,'2NaCl + H<sub>2</sub>SO<sub>4</sub>','Na<sub>2</sub>SO<sub>4</sub> + 2HCl');" type="button" value="Show answer"></p> 
+
+ <p style="font-size:115%; text-align:center;">
+ <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer2">00:00</span>
+  <button type="button" onclick="startTimer('timer2')">Start</button>
+  <button type="button" onclick="stopTimer('timer2')">Stop</button>
+  <button type="button" onclick="resetTimer('timer2')">Reset Timer</button>
+</p>
+  <p></p>
+  <h4>Reactions of Hydrogen Chloride/Hydrochloric acid:</h4>
+  1. Hydrogen Chloride/Hydrochloric acid reacts with silver nitrate solution to form a white precipitate of silver chloride:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q3a> HCl + <input style="font-size: 16px; text-align: center" size=1 name=q3b> AgNO<sub>3</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q3c> 
+  AgCl + <input style="font-size: 16px; text-align: center" size=1 
+  name=q3d> HNO<sub>3</sub></p>  <p style="font-size:115%; text-align:center;"> 
+  <input onclick="check(3,'Reactions of Hydrogen Chloride/Hydrochloric  acid',1,1,1,1,0,0,'HCl + AgNO<sub>3</sub>','AgCl+ HNO<sub>3</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(3,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'HCl + AgNO<sub>3</sub>','AgCl+ HNO<sub>3</sub>');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+  <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer3">00:00</span>
+  <button type="button" onclick="startTimer('timer3')">Start</button>
+  <button type="button" onclick="stopTimer('timer3')">Stop</button>
+  <button type="button" onclick="resetTimer('timer3')">Reset Timer</button>
+</p>
+  <p></p>
+  2.When Hydrogen Chloride gas meets Ammonia gas white fumes of Ammonium chloride are formed:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+   size=1 name=q4a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q4b> NH<sub>3</sub>&#8594; <input style="font-size: 16px; text-align: center" size=1  name=q4c> NH<sub>4</sub>Cl </p> <p style="font-size:115%; text-align:center;"> 
+  <input onclick="check(4,'Reactions of Hydrogen Chloride/Hydrochloric  acid',1,1,1,0,0,0,'HCl + NH<sub>3</sub>','NH<sub>4</sub>Cl');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset"  value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(4,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,0,0,0,'HCl+NH<sub>3</sub>','NH<sub>4</sub>Cl');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer4">00:00</span>
+    <button type="button" onclick="startTimer('timer4')">Start</button>
+    <button type="button" onclick="stopTimer('timer4')">Stop</button>
+    <button type="button" onclick="resetTimer('timer4')">Reset Timer</button>
+  </p>
+  <p></p>
+  3.When magnesium metal is added to Hydrochloric acid, colourless bubbles of Hydrogen gas are liberated: 
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q5a> Mg + <input  style="font-size: 16px; text-align: center" size=1 name=q5b> HCl  &#8594; <input 
+  style="font-size: 16px; text-align: center" size=1 name=q5c> MgCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q5d> H<sub>2</sub> </p> <p style="font-size:115%; text-align:center;"> 
+  <input onclick="check(5,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Mg + HCl','MgCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset"  value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(5,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Mg + 2HCl','MgCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer5">00:00</span>
+    <button type="button" onclick="startTimer('timer5')">Start</button>
+    <button type="button" onclick="stopTimer('timer5')">Stop</button>
+    <button type="button" onclick="resetTimer('timer5')">Reset Timer</button>
+  </p>
+  <p></P>
+4.When zinc metal is added to Hydrochloric acid,colourless bubbles of Hydrogen gas are liberated: 
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q6a> Zn + <input  style="font-size: 16px; text-align: center" size=1 name=q6b> HCl  &#8594; <input 
+  style="font-size: 16px; text-align: center" size=1 name=q6c> ZnCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q6d> H<sub>2</sub></p> <p style="font-size:115%; text-align:center;">
+  <input onclick="check(6,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Zn + HCl','ZnCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp; &nbsp;<input type="reset"  value="Reset">&nbsp;&nbsp;&nbsp; <input onclick="show(6,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Zn + 2HCl','ZnCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer6">00:00</span>
+    <button type="button" onclick="startTimer('timer6')">Start</button>
+    <button type="button" onclick="stopTimer('timer6')">Stop</button>
+    <button type="button" onclick="resetTimer('timer6')">Reset Timer</button>
+  </p> 
+  <p></p>
+5.When iron metal is added to Hydrochloric acid,colourless bubbles of Hydrogen gas are liberated: 
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q7a> Fe + <input  style="font-size: 16px; text-align: center" size=1 name=q7b> HCl  &#8594; <input 
+  style="font-size: 16px; text-align: center" size=1 name=q7c> FeCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q7d> H<sub>2</sub></p>  <p style="font-size:115%; text-align:center;">
+  <input onclick="check(7,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Fe + HCl','FeCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(7,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'Fe + 2HCl','FeCl<sub>2</sub> + H<sub>2</sub>');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer7">00:00</span>
+    <button type="button" onclick="startTimer('timer7')">Start</button>
+    <button type="button" onclick="stopTimer('timer7')">Stop</button>
+    <button type="button" onclick="resetTimer('timer7')">Reset Timer</button>
+  </p> 
+  <p></p>
+6.Magnesium oxide reacts with Hydrochloric acid to form Magnesium chloride and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q8a> MgO + <input  style="font-size: 16px; text-align: center" size=1 name=q8b> HCl  &#8594; <input 
+  style="font-size: 16px; text-align: center" size=1 name=q8c> MgCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q8d> H<sub>2</sub>O</p>  <p style="font-size:115%; text-align:center;">
+  <input onclick="check(8,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'MgO + HCl','MgCl<sub>2</sub> + H<sub>2</sub>O');" type= "button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(8,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'MgO + 2HCl','MgCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer8">00:00</span>
+    <button type="button" onclick="startTimer('timer8')">Start</button>
+    <button type="button" onclick="stopTimer('timer8')">Stop</button>
+    <button type="button" onclick="resetTimer('timer8')">Reset Timer</button>
+  </p> 
+  <p></p>
+ 7.Aluminium oxide reacts with Hydrochloric acid to form Aluminium chloride and water: 
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q9a> Al<sub>2</sub>O<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q9b> HCl  &#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q9c> AlCl<sub>3</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q9d> H<sub>2</sub>O </p> <p style="font-size:115%; text-align:center;">
+  <input onclick="check(9,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,6,2,3,0,0,'Al<sub>2</sub>O<sub>3</sub> + HCl','AlCl<sub>3</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(9,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,6,2,3,0,0,
+'Al<sub>2</sub>O<sub>3</sub> + 6HCl','2AlCl<sub>3</sub> + 3H<sub>2</sub>O');"  type="button" value="Show answer"> </p>
+<p style="font-size:115%; text-align:center;">
+  <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer9">00:00</span>
+  <button type="button" onclick="startTimer('timer9')">Start</button>
+  <button type="button" onclick="stopTimer('timer9')">Stop</button>
+  <button type="button" onclick="resetTimer('timer9')">Reset Timer</button>
+</p>
+  <p></p>
+8.Zinc oxide reacts with Hydrochloric acid to form Zinc chloride and water:
+ 
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q10a> ZnO + <input  style="font-size: 16px; text-align: center" size=1 name=q10b> HCl  &#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q10c> ZnCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q10d> H<sub>2</sub>O </p> <p style="font-size:115%; text-align:center;">
+  <input onclick="check(10,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'ZnO + HCl','ZnCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(10,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'ZnO + 2HCl','ZnCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer10">00:00</span>
+    <button type="button" onclick="startTimer('timer10')">Start</button>
+    <button type="button" onclick="stopTimer('timer10')">Stop</button>
+    <button type="button" onclick="resetTimer('timer10')">Reset Timer</button>
+  </p>
+  <p></p>
+  9.Iron (III) oxide reacts with Hydrochloric acid to form Iron (III) chloride and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q11a>Fe<sub>2</sub>O<sub>3</sub>  + <input  style="font-size: 16px; text-align: center" size=1 name=q11b> HCl  &#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q11c> FeCl<sub>3</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q11d> H<sub>2</sub>O</p>  <p style="font-size:115%; text-align:center;">
+  <input onclick="check(11,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,6,2,3,0,0,'Fe<sub>2</sub>O<sub>3</sub> + HCl','FeCl<sub>3</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp; <input onclick="show(11,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,6,2,3,0,0,'Fe<sub>2</sub>O<sub>3</sub> + 6HCl','2FeCl<sub>3</sub> + 3H<sub>2</sub>O');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer11">00:00</span>
+    <button type="button" onclick="startTimer('timer11')">Start</button>
+    <button type="button" onclick="stopTimer('timer11')">Stop</button>
+    <button type="button" onclick="resetTimer('timer11')">Reset Timer</button>
+  </p>
+  <p></p>
+10.Copper (II) oxide reacts with Hydrochloric acid to form Copper (II) chloride and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q12a> CuO + <input  style="font-size: 16px; text-align: center" size=1 name=q12b> HCl  &#8594; <input 
+  style="font-size: 16px; text-align: center" size=1 name=q12c> CuCl<sub>2</sub> +   <input style="font-size: 18px; text-align: center" size=1 name=q12d> H<sub>2</sub>O</p>  <p style="font-size:115%; text-align:center;">
+  <input onclick="check(12,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'CuO + HCl','CuCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(12,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'CuO + 2HCl','CuCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p>  
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer12">00:00</span>
+    <button type="button" onclick="startTimer('timer12')">Start</button>
+    <button type="button" onclick="stopTimer('timer12')">Stop</button>
+    <button type="button" onclick="resetTimer('timer12')">Reset Timer</button>
+  </p>
+  <p></p>
+11.Dilute Hydrochloric acid reacts with Potassium hydroxide to form Potassium chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q13a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q13b> KOH &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q13c> KCl + <input style="font-size: 16px; text-align: center" size=1 name=q13d> H<sub>2</sub>O</p> <p style="font-size:115%; text-align:center;">
+  <input onclick="check(13,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'HCl + KOH','KCl + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(13,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'HCl + KOH','KCl + H<sub>2</sub>O');" type="button" value="Show answer"></p>  
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer13">00:00</span>
+    <button type="button" onclick="startTimer('timer13')">Start</button>
+    <button type="button" onclick="stopTimer('timer13')">Stop</button>
+    <button type="button" onclick="resetTimer('timer13')">Reset Timer</button>
+  </p>
+<p></p>
+  12.Dilute Hydrochloric acid reacts with Sodium hydroxide to form Sodium chloride and water:
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q14a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q14b> NaOH &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q14c> NaCl + <input style="font-size: 16px; text-align: center" size=1 name=q14d> H<sub>2</sub>O</p> <p style="font-size:115%; text-align:center;">
+  <input onclick="check(14,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'HCl + NaOH','NaCl + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(14,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'HCl + NaOH','NaCl + H<sub>2</sub>O');" type="button" value="Show answer"> </p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer14">00:00</span>
+    <button type="button" onclick="startTimer('timer14')">Start</button>
+    <button type="button" onclick="stopTimer('timer14')">Stop</button>
+    <button type="button" onclick="resetTimer('timer14')">Reset Timer</button>
+  </p> 
+ <p></p>  
+  13.Dilute Hydrochloric acid reacts with Calcium hydroxide to form Calcium chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q15a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q15b> Ca(OH)<sub>2</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q15c> CaCl<sub>2</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q15d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(15,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'HCl + Ca(OH)<sub>2</sub>','CaCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(15,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,0,0,'2HCl + Ca(OH)<sub>2</sub>','CaCl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer15">00:00</span>
+    <button type="button" onclick="startTimer('timer15')">Start</button>
+    <button type="button" onclick="stopTimer('timer15')">Stop</button>
+    <button type="button" onclick="resetTimer('timer15')">Reset Timer</button>
+  </p>
+<p></p>
+
+14.Dilute Hydrochloric acid reacts with  white Magnesium hydroxide to form colourless Magnesium chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q16a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q16b> Mg(OH)<sub>2</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q16c> MgCl<sub>2</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q16d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(16,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'HCl + Mg(OH)<sub>2</sub>','MgCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(16,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'2HCl + Mg(OH)<sub>2</sub>','MgCl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer16">00:00</span>
+    <button type="button" onclick="startTimer('timer16')">Start</button>
+    <button type="button" onclick="stopTimer('timer16')">Stop</button>
+    <button type="button" onclick="resetTimer('timer16')">Reset Timer</button>
+  </p>
+
+<p></p>
+
+15.Dilute Hydrochloric acid reacts with  white Aluminium hydroxide to form colourless Aluminium chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q17a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q17b> Al(OH)<sub>3</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q17c> AlCl<sub>3</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q17d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(17,'Reactions of Hydrogen Chloride/Hydrochloric acid',3,1,1,3,0,0,'HCl + Al(OH)<sub>3</sub>','AlCl<sub>3</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(17,'Reactions of Hydrogen Chloride/Hydrochloric acid',3,1,1,3,0,0,'3HCl + Al(OH)<sub>3</sub>','AlCl<sub>3</sub> + 3H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer17">00:00</span>
+    <button type="button" onclick="startTimer('timer17')">Start</button>
+    <button type="button" onclick="stopTimer('timer17')">Stop</button>
+    <button type="button" onclick="resetTimer('timer17')">Reset Timer</button>
+  </p>
+<p></p>
+
+16.Dilute Hydrochloric acid reacts with white Zinc hydroxide to form colourless Zinc chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q18a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q18b> Zn(OH)<sub>2</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q18c> ZnCl<sub>2</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q18d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(18,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'HCl + Zn(OH)<sub>2</sub>','ZnCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(18,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'2HCl + Zn(OH)<sub>2</sub>','ZnCl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer18">00:00</span>
+    <button type="button" onclick="startTimer('timer18')">Start</button>
+    <button type="button" onclick="stopTimer('timer18')">Stop</button>
+    <button type="button" onclick="resetTimer('timer18')">Reset Timer</button>
+  </p>
+<p></p>
+
+17.Dilute Hydrochloric acid reacts with green Iron(II) hydroxide to form light green Iron(II) chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q19a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q19b> Fe(OH)<sub>2</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q19c> FeCl<sub>2</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q19d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(19,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'HCl + Fe(OH)<sub>2</sub>','FeCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(19,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'2HCl + Fe(OH)<sub>2</sub>','FeCl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer19">00:00</span>
+    <button type="button" onclick="startTimer('timer19')">Start</button>
+    <button type="button" onclick="stopTimer('timer19')">Stop</button>
+    <button type="button" onclick="resetTimer('timer19')">Reset Timer</button>
+  </p>
+<p></p>
+18.Dilute Hydrochloric acid reacts with reddish brown Iron(III)hydroxide to form yellow Iron(III)  chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q20a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q20b> Fe(OH)<sub>3</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q20c> 
+  FeCl<sub>3</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q20d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(20,'Reactions of Hydrogen Chloride/Hydrochloric acid',3,1,1,3,0,0,'HCl + Fe(OH)<sub>3</sub>','FeCl<sub>3</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(20,'Reactions of Hydrogen Chloride/Hydrochloric acid',3,1,1,3,0,0,'3HCl + Fe(OH)<sub>3</sub>','FeCl<sub>3</sub> + 3H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer20">00:00</span>
+    <button type="button" onclick="startTimer('timer20')">Start</button>
+    <button type="button" onclick="stopTimer('timer20')">Stop</button>
+    <button type="button" onclick="resetTimer('timer20')">Reset Timer</button>
+  </p>
+  <p></p>
+  
+19.Dilute Hydrochloric acid reacts with blue copper(II) hydroxide to form blue solution of copper(II)chloride and water:
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
+  size=1 name=q21a> HCl + <input  style="font-size: 16px; text-align: center" size=1 name=q21b> Cu(OH)<sub>2</sub> &#8594; <input style="font-size: 16px; text-align: center" size=1 name=q21c> CuCl<sub>2</sub> + <input style="font-size: 16px; text-align: center" size=1 name=q21d> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(21,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'HCl + Cu(OH)<sub>2</sub>','CuCl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" VALUE="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(21,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,1,1,2,0,0,'2HCl + Cu(OH)<sub>2</sub>','CuCl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer21">00:00</span>
+    <button type="button" onclick="startTimer('timer21')">Start</button>
+    <button type="button" onclick="stopTimer('timer21')">Stop</button>
+    <button type="button" onclick="resetTimer('timer21')">Reset Timer</button>
+  </p>
+<p></p>
+20.Potassium carbonate reacts with Hydrochloric acid to form Potassium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q22a> K<sub>2</sub>CO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q22b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q22c> KCl +  <input style="font-size: 16px; text-align: center" size=1 name=q22d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q22e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(22,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'K<sub>2</sub>CO<sub>3</sub> + HCl','KCl+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(22,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'K<sub>2</sub>CO<sub>3</sub> + 2HCl','2KCl + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer22">00:00</span>
+    <button type="button" onclick="startTimer('timer22')">Start</button>
+    <button type="button" onclick="stopTimer('timer22')">Stop</button>
+    <button type="button" onclick="resetTimer('timer22')">Reset Timer</button>
+  </p>
+  <p></p>
+21.Sodium carbonate reacts with Hydrochloric acid to form Sodium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q23a> Na<sub>2</sub>CO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q23b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q23c> NaCl +   <input style="font-size: 16px; text-align: center" size=1 name=q23d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q23e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(23,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'Na<sub>2</sub>CO<sub>3</sub> + HCl','NaCl+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(23,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'Na<sub>2</sub>CO<sub>3</sub> + 2HCl','2NaCl + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer23">00:00</span>
+    <button type="button" onclick="startTimer('timer23')">Start</button>
+    <button type="button" onclick="stopTimer('timer23')">Stop</button>
+    <button type="button" onclick="resetTimer('timer23')">Reset Timer</button>
+  </p>
+ <p></p>
+22.Calcium carbonate reacts with Hydrochloric acid to form Calcium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q24a> CaCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q24b> HCl&#8594;<input  style="font-size: 16px; text-align: center" size=1 name=q24c> CaCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q24d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q24e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(24,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'CaCO<sub>3</sub> + HCl','CaCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(24,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'CaCO<sub>3</sub> + 2HCl','CaCl<sub>2</sub> + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer24">00:00</span>
+    <button type="button" onclick="startTimer('timer24')">Start</button>
+    <button type="button" onclick="stopTimer('timer24')">Stop</button>
+    <button type="button" onclick="resetTimer('timer24')">Reset Timer</button>
+  </p>
+<p></p>
+23.Magnesium carbonate reacts with Hydrochloric acid to form Magnesium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q25a> MgCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q25b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q25c> MgCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q25d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q25e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(25,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'MgCO<sub>3</sub> + HCl','MgCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(25,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'MgCO<sub>3</sub> + 2HCl','MgCl<sub>2</sub> + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer25">00:00</span>
+    <button type="button" onclick="startTimer('timer25')">Start</button>
+    <button type="button" onclick="stopTimer('timer25')">Stop</button>
+    <button type="button" onclick="resetTimer('timer25')">Reset Timer</button>
+  </p>
+<p></p>
+24.Zinc carbonate reacts with Hydrochloric acid to form Zinc chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q26a> ZnCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q26b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q26c> ZnCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q26d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q26e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(26,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'ZnCO<sub>3</sub> + HCl','ZnCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(26,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'ZnCO<sub>3</sub> + 2HCl','ZnCl<sub>2</sub> + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p>  
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer26">00:00</span>
+    <button type="button" onclick="startTimer('timer26')">Start</button>
+    <button type="button" onclick="stopTimer('timer26')">Stop</button>
+    <button type="button" onclick="resetTimer('timer26')">Reset Timer</button>
+  </p>
+<p></p>
+25.Copper (II) carbonate reacts with Hydrochloric acid to form Copper (II)&nbsp; chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q27a> CuCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q27b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q27c> CuCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q27d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q27e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(27,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'CuCO<sub>3</sub> + HCl','CuCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(27,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'CuCO<sub>3</sub> + 2HCl','CuCl<sub>2</sub> + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"></p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer27">00:00</span>
+    <button type="button" onclick="startTimer('timer27')">Start</button>
+    <button type="button" onclick="stopTimer('timer27')">Stop</button>
+    <button type="button" onclick="resetTimer('timer27')">Reset Timer</button>
+  </p>	
+<p></p>
+26.Potassium bicarbonate reacts with Hydrochloric acid to form Potassium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q28a> KHCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q28b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q28c> KCl +  <input style="font-size: 16px; text-align: center" size=1 name=q28d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q28e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(28,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,1,0,'KHCO<sub>3</sub> + HCl','KCl+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(28,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,1,0,'KHCO<sub>3</sub> + HCl','KCl + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer28">00:00</span>
+    <button type="button" onclick="startTimer('timer28')">Start</button>
+    <button type="button" onclick="stopTimer('timer28')">Stop</button>
+    <button type="button" onclick="resetTimer('timer28')">Reset Timer</button>
+  </p>
+<p></p>
+27.Sodiium bicarbonate reacts with Hydrochloric acid to form Sodiium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q29a> NaHCO<sub>3</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q29b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q29c> NaCl +  <input style="font-size: 16px; text-align: center" size=1 name=q29d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q29e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(29,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,1,0,'NaHCO<sub>3</sub> + HCl','NaCl+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(29,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,1,1,1,1,0,'NaHCO<sub>3</sub> + HCl','NaCl + CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer29">00:00</span>
+    <button type="button" onclick="startTimer('timer29')">Start</button>
+    <button type="button" onclick="stopTimer('timer29')">Stop</button>
+    <button type="button" onclick="resetTimer('timer29')">Reset Timer</button>
+  </p>
+<p></p>
+28.Calcium bicarbonate reacts with Hydrochloric acid to form Calcium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q30a> Ca(HCO<sub>3</sub>)<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q30b> HCl&#8594;<input  style="font-size: 16px; text-align: center" size=1 name=q30c> CaCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q30d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q30e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(30,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,2,2,0,'Ca(HCO<sub>3</sub>)<sub>2</sub> + HCl','CaCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(30,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,2,2,0,'Ca(HCO<sub>3</sub>)<sub>2</sub> + 2HCl','CaCl<sub>2</sub> + 2CO<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer30">00:00</span>
+    <button type="button" onclick="startTimer('timer30')">Start</button>
+    <button type="button" onclick="stopTimer('timer30')">Stop</button>
+    <button type="button" onclick="resetTimer('timer30')">Reset Timer</button>
+  </p>
+ <p></p>
+29.Magnesium bicarbonate reacts with Hydrochloric acid to form Magnesium chloride, carbon dioxide and water:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q31a> Mg(HCO<sub>3</sub>)<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q31b> HCl&#8594;<input  style="font-size: 16px; text-align: center" size=1 name=q31c> MgCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q31d> CO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q31e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(31,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,2,2,0,'Mg(HCO<sub>3</sub>)<sub>2</sub> + HCl','MgCl<sub>2</sub>+ CO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(31,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,2,2,0,'Mg(HCO<sub>3</sub>)<sub>2</sub> + 2HCl','MgCl<sub>2</sub> + 2CO<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer31">00:00</span>
+    <button type="button" onclick="startTimer('timer31')">Start</button>
+    <button type="button" onclick="stopTimer('timer31')">Stop</button>
+    <button type="button" onclick="resetTimer('timer31')">Reset Timer</button>
+  </p>
+<p></p>
+30.Sodium Sulphite reacts with dilute Hydrochloric acid to form Sodium choride, Sulphur dioxide gas and water: 
+  
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center;" 
+  size=1 name=q32a> Na<sub>2</sub>SO<sub>3</sub> + <input  style="font-size: 16px; text-align: center;" size=1 name=q32b> HCl &#8594; <input style="font-size: 16px; text-align:center;" size=1 name=q32c> NaCl+ <input style="font-size: 16px; text-align:center;" size=1   name=q32d> SO<sub>2</sub> +<input style="font-size: 16px; text-align:center;" size=1   name=q32e>H<sub>2</sub>O </p>
+   <p style="font-size:115%; text-align:center;"><input onclick="check(32,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'Na<sub>2SO<sub>3</sub> + HCl','NaCl + SO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(32,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,2,1,1,0,'Na<sub>2</sub>SO<sub>3</sub> + 2HCl','2NaCl + SO<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Show answer"> </p>
+   <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer32">00:00</span>
+    <button type="button" onclick="startTimer('timer32')">Start</button>
+    <button type="button" onclick="stopTimer('timer32')">Stop</button>
+    <button type="button" onclick="resetTimer('timer32')">Reset Timer</button>
+  </p>
+ <p></p>
+31.When Iron (II)Sulphide is reacted with dilute Hydrochloric acid, Hydrogen sulphide gas is formed: 
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center;" 
+   size=1 name=q33a> FeS + <input style="font-size: 16px; text-align:center;" size=1 name=q33b> HCl &#8594; <input style="font-size: 16px; text-align: center;" size=1 name=q33c> FeCl<sub>2</sub>+ <input style="font-size:16px;text-align:center" size=1 name=q33d> H<sub>2</sub>S</p> 
+ <p style="font-size:115%; text-align:center;">    
+<input onclick="check(33,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'FeS + HCl','FeCl<sub>2</sub> + H<sub>2</sub>S');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">  &nbsp;&nbsp;&nbsp; <input onclick="show(33,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,0,0,'FeS + 2HCl','FeCl<sub>2</sub> + H<sub>2</sub>S');" type="button" value="Show answer"></p>
+<p style="font-size:115%; text-align:center;">
+  <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer33">00:00</span>
+  <button type="button" onclick="startTimer('timer33')">Start</button>
+  <button type="button" onclick="stopTimer('timer33')">Stop</button>
+  <button type="button" onclick="resetTimer('timer33')">Reset Timer</button>
+</p>
+ <p></p>
+32.Manganese (IV)oxide oxidizes concentrated Hydrochloric acid into Chlorine gas:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q34a> MnO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q34b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q34c> MnCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q34d> Cl<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q34e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(34,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,4,1,1,2,0,'MnO<sub>2</sub> + HCl','MnCl<sub>2</sub>+ Cl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(34,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,2,1,1,1,0,'MnO<sub>2</sub> + 4HCl','MnCl<sub>2</sub> + Cl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer34">00:00</span>
+    <button type="button" onclick="startTimer('timer34')">Start</button>
+    <button type="button" onclick="stopTimer('timer34')">Stop</button>
+    <button type="button" onclick="resetTimer('timer34')">Reset Timer</button>
+  </p>
+  <p></p>
+33.Lead (IV) oxide oxidizes concentrated Hydrochloric acid into Chlorine gas:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q35a> PbO<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q35b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q35c> PbCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q35d> Cl<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q35e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(35,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,4,1,1,2,0,'PbO<sub>2</sub> + HCl','PbCl<sub>2</sub>+ Cl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(35,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,4,1,1,2,0,'PbO<sub>2</sub> + 4HCl','PbCl<sub>2</sub> + Cl<sub>2</sub> + 2H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer35">00:00</span>
+    <button type="button" onclick="startTimer('timer35')">Start</button>
+    <button type="button" onclick="stopTimer('timer35')">Stop</button>
+    <button type="button" onclick="resetTimer('timer35')">Reset Timer</button>
+  </p>
+  <p></p>
+34.Red lead (Tri lead tetroxide) oxidizes concentrated Hydrochloric acid into Chlorine gas:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q36a> Pb<sub>3</sub>O<sub>4</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q36b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q36c> PbCl<sub>2</sub> +   <input style="font-size: 16px; text-align: center" size=1 name=q36d> Cl<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q36e> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(36,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,8,3,1,4,0,'Pb<sub>3</sub>O<sub>4</sub> + HCl','PbCl<sub>2</sub>+ Cl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(36,'Reactions of Hydrogen Chloride/Hydrochloric acid',1,8,3,5,4,0,'Pb<sub>3</sub>O<sub>4</sub> + 8HCl','3PbCl<sub>2</sub> + Cl<sub>2</sub> + 4H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer36">00:00</span>
+    <button type="button" onclick="startTimer('timer36')">Start</button>
+    <button type="button" onclick="stopTimer('timer36')">Stop</button>
+    <button type="button" onclick="resetTimer('timer36')">Reset Timer</button>
+  </p>
+ <p></p>
+35.Potassium permanganate oxidizes concentrated Hydrochloric acid into Chlorine gas:
+
+  <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center"  size=1 name=q37a> KMnO<sub>4</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q37b> HCl&#8594; <input  style="font-size: 16px; text-align: center" size=1 name=q37c> KCl +   <input style="font-size: 16px; text-align: center" size=1 name=q37d>MnCl<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q37e>Cl<sub>2</sub> + <input  style="font-size: 16px; text-align: center" size=1 name=q37f> H<sub>2</sub>O</p><p style="font-size:115%; text-align:center;">
+  <input onclick="check(37,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,16,2,2,5,8,'KMnO<sub>4</sub> + HCl','KCl+ MnCl<sub>2</sub>+ Cl<sub>2</sub> + H<sub>2</sub>O');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(37,'Reactions of Hydrogen Chloride/Hydrochloric acid',2,16,2,2,5,8,'2KMnO<sub>4</sub> + 16HCl','2KCl+ 2MnCl<sub>2</sub> + 5Cl<sub>2</sub> + 8H<sub>2</sub>O');" type="button" value="Show answer"></p> 
+  <p style="font-size:115%; text-align:center;">
+    <span style="color:blue;"><b>Time Taken:</b></span><span class="timer" id="timer37">00:00</span>
+    <button type="button" onclick="startTimer('timer37')">Start</button>
+    <button type="button" onclick="stopTimer('timer37')">Stop</button>
+    <button type="button" onclick="resetTimer('timer37')">Reset Timer</button>
+  </p>
+  
+<p></p>
+
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+	
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