Q19 / 57 · JEE Advanced 2009 (Paper 2) · Chemistry

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

Correct answer: 4

Hence, the correct answer is 4.

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