1.

Atthe root mean square (rms) speed of a gas X (molecular weightis equal to the most probable speed of gas Y atThe molecular weight of the gas Y is :

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Solution :Given, `u_(rm s) = u_(m p) rArr sqrt((3RT)/(M(X))) = sqrt((2RT)/(M(Y))) rArr (3R xx 400)/(40) = (2R xx 60)/((M_(Y)) rArr M (Y) = 4`


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