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One litre of a gaseous mixture of two gases effuses in 311 seconds while 2 litres of oxygen takes 20 minutes. The vapour density of gaseous mixture containing ${CH}_{4}$ and $H_{2}$ is:

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3.4

4.3

answer is B.

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Detailed Solution

Vapour density of the mixture can be calculated as

$\frac{\frac{1}{311}}{\frac{2}{1200}} = \sqrt{\frac{M_{O_{2}}}{M_{mix}}}$ $\Rightarrow M_{mix} = 8.6$

$∴ V.D = 4.3$

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