The absolute zero is the temperature at which

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(C) Absolute zero is defined as $0 \,K$ or $-273.15 \,^\circ C$.According to the kinetic theory of gases, the root mean square velocity $(v_{rms})$ of

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Molecular motion ceases

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(C) Absolute zero is defined as $0 \,K$ or $-273.15 \,^\circ C$.According to the kinetic theory of gases, the root mean square velocity $(v_{rms})$ of gas molecules is given by $v_{rms} = \sqrt{\frac{3RT}{M}}$.At $T = 0 \,K$, the velocity $v_{rms}$ becomes zero.This implies that the random thermal motion of molecules ceases at absolute zero.Therefore, option $(C)$ is correct.

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