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Avogadro's Law & Gay Lussac's Law

20 ml of a ga...

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 $O_{2} = 400 \times 0.20 = 80 m l$

Thus, volume of residual $N_{2} = (400 - 80) = 320 m l$

So, the correct option is $C$ .

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