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Q.

At 400 K, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60K. The molecular weight of the gas Y is

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a

b

c

d

answer is D.

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Detailed Solution

urms=umps=3RTM(X)=2RTM(Y)          =3R×40040=2R×60M(Y)M(Y)=4
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