12,1.html

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<p>Brass gets discoloured in air because of the presence of which of the following gases in air?</p>
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<input type="radio" name="g">1.Oxygen<br>
<input type="radio" name="g">2.Hydrogen sulphide<br>
<input type="radio" name="g">3.Carbon dioxide<br>
<input type="radio" name="g">4.Nitrogen<br>
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 <button  type="button";>SUBMIT</button>	
 
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