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Question

10 ml of a mixture of CH4,C2H4 and CO2 were exploded with excess of air. After explosion, there was contraction on cooling of 17 ml and after treatment with KOH, there was further reduction of 14 ml. What is the composition of the mixture?

A
CH4=4.5ml,CO2=1.5ml
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B
CH4=3.6ml,CO2=2.5ml
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C
CH4=4.8ml,CO2=1.8ml
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D
CH4=5.1ml,CO2=2.8ml
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Solution

The correct option is D CH4=4.5ml,CO2=1.5ml
The contraction on cooling is due to the condensation of water vapour. Thus 17 ml of water are formed in the reaction.
The contraction in the volume of 14 ml is due to the dissolution of carbon dioxide gas. Hence, 14 g of carbon dioxide is present in the mixture after the explosion.
CH44.5mlCO24.5ml+2H2O9ml
C2H44ml2CO28+2H2O8ml

Hence, the composition of the mixture is 4.5 ml methane and 1.5 ml of carbon dioxide.

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