Physics · Kinetic Theory of Gases

JEE Main 2025 — 28 January, Evening Shift — Question 50

The ratio of vapour densities of two gases at the same temperature is 4/25, then the ratio of r.m.s. velocities will be :

Option A:
25/4
Option B:
2/5
Option C:
5/2
Correct
Option D:
4/25

Answer: C

Step-by-step solution

$\frac{\rho_{1}}{\rho_{2}}=\frac{4}{25}$

Ratio of rms velocities $=\sqrt{\frac{\rho_{2}}{\rho_{1}}}=\frac{5}{2}$

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 28 January, Evening Shift
Subject: Physics
Chapter: Kinetic Theory of Gases
Topic: Pressure of Gas and Different speeds of Gas Molecules

The kinetic energy of translation of the molecules in 50 g of CO 2 gas at 17^circ C is :

The ratio of vapour densities of two gases at the same temperature is… | JEE Main 2025 PYQ with Solution · DhiX AI