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@@ -63,7 +63,7 @@ <h3>Note:</h3>If you get no response after clicking 'Check answer' or 'Show answ
 <li>When A mixture of Nitrogen gas and Hydrogen gas is passed over Iron catalyst at 200 atm pressure and 450<sup>o</sup>C, Ammonia gas is formed (Haber Process):</li>
   
   <p style="font-size:115%; text-align:center;"><input style="font-size: 16px; text-align: center" 
-  size=1 name=q4a></input> N<sub>2</sub> + <input style="font-size: 16px; text-align:center" size=1 name=q4b></input> H<sub>2</sub>&nbsp;&nbsp;<img src="ebce2.gif" />&nbsp;&nbsp;<input style="font-size: 16px; text-align: center" size=1 name=q4c></input> NH<sub>3</sub></p> 
+  size=1 name=q4a></input> N<sub>2</sub> + <input style="font-size: 16px; text-align:center" size=1 name=q4b></input> H<sub>2</sub>&nbsp;&nbsp;&#8652&nbsp;&nbsp;<input style="font-size: 16px; text-align: center" size=1 name=q4c></input> NH<sub>3</sub></p> 
   
 <p style="font-size:115%; text-align:center;"><input onclick="check(4,'Preparation of Ammonia',1,3,2,0,0,0,'N<sub>2</sub> + H<sub>2</sub>','NH<sub>3</sub>');" type="button"  value="Check answer"></input>&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="Reset"> </input> &nbsp;&nbsp;&nbsp; <input onclick="show(4,'Preparation of Ammonia',1,3,2,0,0,0,'N<sub>2</sub> + 3H<sub>2</sub>','2NH<sub>3</sub> ');" type="button" value="Show answer"></input></p></ol>