\( C_{p} \) is always greater than \( C_{v} \) for a gas. Choose the correct option. (A) When a ...

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\( C_{p} \) is always greater than \( C_{v} \) for a gas. Choose the correct option.
(A) When a gas absorbs heat at constant pressure, its volume remains unchanged.
(B) No work is done by a gas at constant volume.
(C) For the same change in temperature, the internal energy of a gas changes by a smaller amount at constant volume than at constant pressure.
(D) The mass of a gas at constant pressure is greater than that at constant volume.
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