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Q.

A 20 ml mixture of C2H4 and C2H2 undergoes sparking in gas eudiometer with just sufficient amount of O2 and shows contraction of 37.5 ml.
Volume (in ml) of C2H2 in the mixture is :

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answer is 5.

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Detailed Solution

C2H4+3O2→2CO2+2H2O

C2H2+52O2→2CO2+H2O(20−V) 52(20−V) (20−V)×220+3V+52(20−V)−[2V+2(20−V)]=37.530+V2=37.5⇒ V=15ml

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