IIT-JEE 2007 · Paper 2 · Physics Q13

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PhysicsAssertion and reason+3 / -1Question 13 of 66

STATEMENT-1: The total translational kinetic energy of all the molecules of a given mass of an ideal gas is 1.5 times the product of its pressure and its volume.

because

STATEMENT-2: The molecules of a gas collide with each other and the velocities of the molecules change due to the collision.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

Answer and worked solution

Official answer: B

Statement 1. Total translational kinetic energy is $\frac32nRT=\frac32PV$ . True.

Statement 2. Molecules do collide and their velocities change. True, but the result in Statement 1 comes from kinetic theory of the pressure (molecules hitting the walls), not from intermolecular collisions.

(B)

Topics:Kinetic interpretation of temperature

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IIT-JEE 2007 · Paper 2, Physics question 13