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Q.

20 ml of ethyne requires …… ml of air at STP for complete combustion.

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a

50 ml

b

25 ml

c

238 ml

d

192 ml

answer is C.

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Detailed Solution

C2H2g + 52O2g → 2CO2g + H2Ol ; 20ml          50ml           Volume of oxygen required=50ml; Air contains 21% by volume of oxygen ; Volume of air required=10021×50=238 ml ;
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20 ml of ethyne requires …… ml of air at STP for complete combustion.