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JEE Main202226 Jun 2022Evening ShiftPhysicsKinetic Theory of GasesActual

A flask contains argon and oxygen in the ratio of 3 : 2 in mass and the mixture is kept at 27 ° C . The ratio of their average kinetic energy per molecule respectively

Options

  1. A3 : 5
  2. B9 : 4
  3. C2 : 3
  4. D1 : 1

Correct answer

A. 3 : 5

Step-by-step solution

Given here, m Ar m O = 3 2 . As argon is monoatomic gas, so it has three degree of freedom f and oxygen is a diatomic gas, so its degree of freedom is five. We know that average kinetic energy per molecule is given by K E = f 2 k T , where, k is Boltzmann's constant and T is temperature. Here, T = 27 ° C is fixed for both gas. So, K E Ar K E O = 3 2 k T 5 2 k T = 3 5

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