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Question

The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is:

A
64
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B
32
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C
4
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D
8
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Solution

The correct option is A 64
According to Graham's law of diffusion, the rates of diffusion of gases are inversely proportional to the square root of their molecular weights.
rCH4rx=MCH4Mx
Substitute values in the above expression.
rCH4rx=2=Mx16
Thus the molecular weight is 64 g/mol.

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