An unknown gas is placed in a sealed container with a fixed volume. Which of the characteristics listed change(s) when the container is heated from 25° C to 250° C?
(P) The density of the gas
(Q) The average kinetic energy of the molecules
(R) The mean free path between molecular collisions

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R only

P only

Q only

P and Q only

answer is B.

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Detailed Solution

The average molecular kinetic energy will be linearly proportional to the absolute temperature of the gas. This implies that molecules of various gases have the same average kinetic energy when they are at the same temperature.

So, option B is correct answer

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