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JEE Main202120 Jul 2021Morning ShiftPhysicsKinetic Theory of GasesActual

Consider a mixture of gas molecule of types A , B and C having masses m A < m B < m C . The ratio of their root mean square speeds at normal temperature and pressure is:

Options

  1. Av A = v B = v C = 0
  2. B1 v A > 1 v B > 1 v C
  3. Cv A = v B ≠ v C
  4. D1 v A < 1 v B < 1 v C

Correct answer

D. 1 v A < 1 v B < 1 v C

Step-by-step solution

V rms = 3 R T M m A < m B < m C ⇒ V A > V B > V C ⇒ 1   V A < 1   V B < 1   V C

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