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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 gas X is:

A
64
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B
32
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C
16
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D
8
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Solution

The correct option is A 64
According to Graham's law of diffusion,
rate1Molecularweight
rate1rate2=M2M1
(rate)methane=2×(rate)another gas(X)(rate)gas X=x(rate)methane(rate)anothergas(X)=MolecularweightofX1621=MolecularweightofX16
Molecular weight of gas X=64 g/mole

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