\( 50 \mathrm{ml} \) of a gas \( \mathrm{A} \) diffuse through a membrane in the same time as fo...

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\( 50 \mathrm{ml} \) of a gas \( \mathrm{A} \) diffuse through a membrane in the same time as for the diffusion of \( 40 \mathrm{ml} \) of a gas
(W) \( \mathrm{B} \) under identical pressure and temperature conditions. If the Molecular weight of \( A=64 \), that of \( \mathrm{B} \) would be:
(1) 100
(2) 250
(3) 200
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