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Question

The rate of diffusion of a gas X is 2 times that of Y. If the molecular weight of X is 16, the molecular weight of Y is:

A
32
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B
82
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C
322
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D
162
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Solution

The correct option is A 32
RX,RY and MX,MY are the rate of diffusion and molar mass of X and Y respectively.

So here, RXRY=2

RXRY=MYMX=MY16=MY16

RXRY=2=MY4

MY=(42)2
Hence, the molecular weight of Y = 32 u.

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