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Internal energy of $H_{2} O$ remains constant during conversion of liquid into its vapour at constant temperature.

During fusion of ice into water enthalpy change and internal energy change are almost same at constant temperature

Molar heat capacity of gases are temperature dependent

During compression of an ideal gas at constant pressure, the temperature of gas decreases.

answer is B.

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Detailed Solution

Internal energy of $H_{2} O$ does not remain constant during conversion of liquid into its vapour at constant temperature. So option A is incorrect.

Option B, C and D are correct.

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