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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>Ozone</title>
+    <script src="chem2.js" defer></script>
+    <script src="timer.js" defer></script>
+   <meta name="Keywords" content="exercises,  balancing,  chemistry, equations, fluorine, ozone, potassium-dichromate, potassium permanganate, preparation ">
+    <meta name="author" content="Jiban Majumdar">
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+  <table class="center">
+<tr>
+<td><a href="index.html">Home Page</a></td>
+<td><a href="equations.html">Intermediate Equations</a></td>
+<td><a href="assorted.html">Assorted Equations</a></td>
+<td><a href="fluorine.html">Fluorine</a></td>
+<td><a href="potassium-dichromate.html">Potassium Dichromate</a></td>
+<td><a href="potassium-permanganate.html">Potassium Permanganate</a></td>
+<td><a href="hydrogen-peroxide.html">Hydrogen Peroxide</a></td>
+</tr>
+</table>
+
+<h1 style="text-align:center;"> Ozone </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> 
+<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 Ozone:</h4> <ul><li>Ozone is manufactured by passing silent electric discharge through pure, cold and dry oxygen in Siemen's Ozoniser:</li></ul>
+  <p style="font-size:115%; text-align:center;"><input style= "font-size: 16px;text-align: center" 
+ size=1 name=q1a> O<sub>2</sub> &#8594; <input style= "font-size: 16px;text-align: center" size=1 name=q1b> O<sub>3</sub>
+  <p style="font-size:115%; text-align:center;"><input onclick="check(1,'Preparation of Ozone',3,2,0,0,0,0,0,'O<sub>2</sub>','O<sub>3</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(1,'Preparation of Ozone',3,2,0,0,0,0,0,'3O<sub>2</sub>',' 2O<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="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>
+<p></p>
+ <h4>Reactions of Ozone:</h4> 
+
+  1. Ozone oxidizes Lead(II)sulphide(black) into Lead(II)sulphate(white):
+  <p style="font-size:115%; text-align:center;"><input style= "font-size: 16px;text-align: center" 
+ size=1 name=q2a> PbS + <input  style= "font-size: 16px;text-align: center" size=1 name=q2b> O<sub>3</sub>&#8594; <input style= "font-size: 16px;text-align: center" size=2  name=q2c> PbSO<sub>4</sub> + <input style= "font-size: 16px;text-align: center" size=2  name=q2d> O<sub>2</sub></p>
+ <p style="font-size:115%; text-align:center;"> <input onclick="check(2,'Reactions of Ozone',1,4,1,4,0,0,0,'PbS + O<sub>3</sub>','PbSO<sub>4</sub> + O<sub>2</sub>');" type="button"  value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp; <input onclick="show(2,'Reactions of Ozone',1,4,1,4,0,0,0,'PbS + 4O<sub>3</sub>','PbSO<sub>4</sub> + 4O<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="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>
+  2. Ozone oxidizes Potassium iodide into iodine: 
+  <p style="font-size:115%; text-align:center;"><input style= "font-size: 16px;text-align: center" 
+ size=1 name=q3a> KI + <input  style= "font-size: 16px;text-align: center" size=1 name=q3b> O<sub>3</sub> +  <input  style= "font-size: 16px;text-align: center" size=1 name=q3c> H<sub>2</sub>O &#8594; <input style= "font-size: 16px;text-align: center" size=1 name=q3d> I<sub>2</sub> + <input style= "font-size: 16px;text-align: center" size=1 name=q3e> KOH +  <input  style= "font-size: 16px;text-align: center" size=1 name=q3f> O<sub>2</sub></p>
+  <p style="font-size:115%; text-align:center;"><input onclick="check(3,'Reactions of Ozone',2,1,1,1,2,1,0,'KI + O<sub>3</sub> + H<sub>2</sub>O','I<sub>2</sub> + KOH + O<sub>2</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 Ozone',2,1,1,1,2,1,0,'2KI + O<sub>3</sub> + H<sub>2</sub>O','I<sub>2</sub> + 2KOH + O<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="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>
+  3. Ozone oxidises mercury into mercury(I)oxide (mercurous oxide), which dissolves in mercury. Due to this mercury loses ints meniscus and starts sticking to the sides of glass. This is known as <span style= "color:blue;"><b>Tailing of Mercury:</b></span> 
+  <p style="font-size:115%; text-align:center;"><input style= "font-size: 16px;text-align: center" 
+ size=1 name=q4a> Hg + <input  style= "font-size: 16px;text-align: center" size=1 name=q4b> O<sub>3</sub> &#8594; <input style= "font-size: 16px;text-align: center" size=1 name=q4c> Hg<sub>2</sub>O + <input style= "font-size: 16px;text-align: center" size=1 name=q4d> O<sub>2</sub></p>
+  <p style="font-size:115%; text-align:center;"><input onclick="check(4,'Reactions of Ozone',2,1,1,1,0,0,0,'Hg + O<sub>3</sub>','Hg<sub>2</sub>O + O<sub>2</sub>');" type="button" value="Check answer">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset">&nbsp;&nbsp;&nbsp;&nbsp;  <input onclick="show(4,'Reactions of Ozone',2,1,1,1,0,0,0,'2Hg + O<sub>3</sub>','Hg<sub>2</sub>O + O<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="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>
+
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+  <tr>
+  <td><a href="index.html">Home Page</a></td>
+  <td><a href="equations.html">Intermediate Equations</a></td>
+  <td><a href="assorted.html">Assorted Equations</a></td>
+  <td><a href="fluorine.html">Fluorine</a></td>
+  <td><a href="potassium-dichromate.html">Potassium Dichromate</a></td>
+  <td><a href="potassium-permanganate.html">Potassium Permanganate</a></td>
+  <td><a href="hydrogen-peroxide.html">Hydrogen Peroxide</a></td>
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