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Which is an irreversible process?

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Mixing of two gases by diffusion

Evaporation of water at 373 K and 1 atm pressure

Dissolution of $NaCl$ in water

Melting of ice at 273 K and 1 atm

answer is A, C.

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Detailed Solution

Mixing of two gases by diffusion is irreversible as it can not be reversed.

Dissolution of $NaCl$ in water is also irreversible entropy of ions of salt in liquid state is greater than solid state.

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