Kinetic Theory

JEE Main 2025 (Online) 28th January Evening ShiftMCQEasy📈 Topic in 5% papers+4−1

Ques. 1JEE Main 2025, 28 January (Evening Shift)

The ratio of vapour densities of two gases at the same temperature is 425, then the ratio of r.m.s. velocities will be :

Answer

(1) 52

Solution

Vapour density D = M2 M D

M1M2 = D1D2 = 425

vrms = 3RTM vrms 1 M (same T)

v1v2 = M2M1 = 254 = 52

Answer: (1)

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Ques. 2JEE Main 2025, 28 January (Evening Shift)

The kinetic energy of translation of the molecules in 50 g of CO2 gas at 17 is :

4205.5 J
3582.7 J
3986.3 J
4102.8 J

Ques. 3JEE Main 2025, 22 January (Evening Shift)

For a diatomic gas, if 1= ( CpCv ) for rigid molecules and 2= ( CpCv ) for another diatomic molecules, but also having vibrational modes. Then, which one of the following options is correct? (Cp and Cv are specific heats of the gas at constant pressure and volume)

2< 1
2> 1
2= 1
2 2= 1

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