JEE Main 2022 · 28 Jul · Shift 1 · Physics Q38

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PhysicsSingle correct+4 / -1Question 38 of 90

Given below are two statements :

Statement I : The average momentum of a molecule in a sample of an ideal gas depends on temperature.

Statement II : The rms speed of oxygen molecules in a gas is $v$ . If the temperature is doubled and the oxygen molecules dissociate into oxygen atoms, the rms speed will become $2v$ .

In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Answer and worked solution

Official answer: D

Statement I. The average momentum (a vector) is zero at any temperature. False.

Statement II. $v_{rms}\propto\sqrt{T/M}$ : doubling T and halving M doubles it. True.

(D)

Topics:Molecular speeds

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JEE Main 2022 · 28 Jul · Shift 1, Physics question 38