Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: If the average kinetic energy of H₂ and O₂ molecules, kept in two different sized containers are same, then their temperatures will be same. Reason R: The r.m.s speed of H₂ and O₂ molecules are same at same temperature. Choose the correct answer from the options given below (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is NOT the correct explanation of A (c) A is true but R is false (d) A is false but R is true

Answer: (c). A: average KE = 3/2kT depends only on T, so equal KE means equal T, whatever the container size. A is true. R: vrms = √(3RT/M); M differs for H₂ (2) and O₂ (32), so the speeds differ. R is false. So the answer is (c).

Given below are two statements: one is labelled as Assertion A and… | JEE Main 2026 (4 Apr, Shift 2)

Q4JEE Main 2026 · 4 APR · SHIFT 2Easy

Molecular Speeds & Maxwell Distribution

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: If the average kinetic energy of $\text{H}_2$ and $\text{O}_2$ molecules, kept in two different sized containers are same, then their temperatures will be same.

Reason R: The r.m.s speed of $\text{H}_2$ and $\text{O}_2$ molecules are same at same temperature. Choose the correct answer from the options given below

Show answer and solution

Answer: (c)

A: average KE $= \frac{3}{2}kT$ depends only on $T$ , so equal KE means equal $T$ , whatever the container size. A is true.
R: $v_{rms} = \sqrt{\frac{3RT}{M}}$ ; $M$ differs for $\text{H}_2$ (2) and $\text{O}_2$ (32), so the speeds differ. R is false.
So the answer is (c).

Report a mistake

Molecular Speeds & Maxwell Distribution question from JEE Main 2026 (4 Apr, Shift 2)

More questions on Molecular Speeds & Maxwell Distribution