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JEE Main 2026 (21 Jan, Shift 2) · Molecular Speeds & Maxwell Distribution

Molecular Speeds & Maxwell Distribution question from JEE Main 2026 (21 Jan, Shift 2)

Q8JEE Main 2026 · 21 JAN · SHIFT 2Medium

Molecular Speeds & Maxwell Distribution

The r.m.s. speed of oxygen molecules at 47 °C is equal to that of the hydrogen molecules kept at _________ °C. (Mass of oxygen molecule/mass of hydrogen molecule = 32/2)

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Answer: (b)

Equal $v_{rms}$ means equal $\frac{T}{M}$ .
$T_O = 47 + 273 = 320\text{ K}$ ; $T_H = 320 \times \frac{2}{32} = 20\text{ K}$
$20 - 273 = -253^\circ\text{C}$
So the answer is (b) $-253$ .

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