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Kinetic Theory · Question 20

JEE Main 2025 (Online) 28th January Evening ShiftMCQEasy📈 Topic in 6% papers+4−1
1

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

  1. 52
  2. 254
  3. 425
  4. 25

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)

JEE Main 2025 (Online) 28th January Evening Shift

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2

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

  1. 4205.5 J
  2. 3582.7 J
  3. 3986.3 J
  4. 4102.8 J
JEE Main 2025 (Online) 28th January Evening Shift

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