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JEE Advanced · Chemistry · 5. States of Matter

Which of the following statement(s) (are) correct regarding the root mean square speed Urms and average translational kinetic energy εav of a molecule in a gas at equilibrium?

  1. A Urms is doubled when its temperature is increased four times
  2. B εav at a given temperature does not depend on its molecular mass
  3. C Urms is inversely proportional to the square root of its molecular mass
  4. D εav is doubled when its temperature is increased four times
Verified Solution

Answer & Solution

Correct Answer

(A) Urms is doubled when its temperature is increased four times

Step-by-step Solution

Detailed explanation

Urms=3RTM, Eav=32RT
If temperature is made 4 times, Urms between twice.
Avg. kinetic energy (Fav) is independent of molecular man at a given temperature,
Urms inversely proportional to the square not of molecular mass.
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