Q69 · CSIR NET Chemistry, December 2018
Paper: CSIR NET December 2018 · Subject: Physical Chemistry · Chapter: Atomic and Molecular Term Symbol · Topic: Atomic And Molecular Term Symbols – General · Marks: 2 · Difficulty: Easy
Root mean square speed of the molecules of a perfect gas is proportional to
(a)$1 / \mathrm{T}_{1 / 2}$
(b)T
(c)$\mathrm{T}_{1 / 2}$
(d)$1 / \mathrm{T}$
Answer
Answer: C ✓ checked by 4AB · confidence high
The source book printed D; on checking, C is correct — see the explanation.
Printed D; the rms speed grows with temperature.
Explanation
c_rms = √(3RT/M) ∝ T^½.
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