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# The reason why $Cp$ is greater than $Cv$ is _______

(A)The temperature rise while heating at constant pressure is less (B) At constant volume, no work is done. (C) At constant pressure, no work is done. (D)none of these

Since $\Delta Q =\Delta u+ \Delta w$ and at constant volume, $\Delta w=0$ , So Cv accounts only for the heat given i raising internal energy whereas $C_p$ accounts for the heat which raises internal energy and accounts for work done
Hence B is the correct answer.