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Question

The molecules of gas A travel four times faster than the molecules of gas B at the same temperature. The ratio of molecular weights (MA/MB) will be:

A
1/16
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B
4
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C
1/4
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D
16
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Solution

The correct option is A 1/16
Let rate of diffusion of gas B =x
Rate of diffusion of gas A =4x

We know that rArB=MBMA

where rA is rate of diffusion of gas A
where rB is rate of diffusion of gas B
where MA is molecular gas of gas A
where MB is rate of diffusion of gas B

41=MBMA

MBMA=161

MAMB=116

Hence, option A is correct.

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