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(C) According to the kinetic theory of gases,the average kinetic energy of a gas molecule is directly proportional to the absolute temperature of the

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kinetic energy

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(C) According to the kinetic theory of gases,the average kinetic energy of a gas molecule is directly proportional to the absolute temperature of the gas.Specifically,the average kinetic energy is given by the formula $K_{avg} = \frac{3}{2} k_B T$,where $k_B$ is the Boltzmann constant and $T$ is the absolute temperature.Since the temperature $T$ is constant for all molecules of a gas in thermal equilibrium,the average kinetic energy remains the same for all molecules.Other quantities like velocity,momentum,and angular momentum vary from molecule to molecule due to collisions and the Maxwell-Boltzmann distribution of speeds.Therefore,the correct option is $C$.

For a gas at a particular temperature on an average,the quantity which remains same for all molecules is

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