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Question

20 ml of a gaseous hydrocarbon required 400 ml of air for complete combustion. The air contains 20% by volume of oxygen. The volume of the gaseous mixture after explosion and cooling was found to be 380 ml.

Volume of residual nitrogen is ______________ .

A
300 ml
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B
310 ml
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C
320 ml
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D
330 ml
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Solution

The correct option is C 320 ml
According to given,

Volume of O2=400×0.20=80ml

Thus, volume of residual N2=(40080)=320ml

So, the correct option is C.

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