Q.

Which of the following process must be spontaneous?

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a

An adiabatic process with constant volume condition and entropy of system increasing

b

A process with constant internal energy and isothermal with an increase in entropy of system.

c

Isobaric and isentropic process with negative enthalpy change.

d

Isochoric and isothermal process with negative internal energy change.

answer is A, D.

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Detailed Solution

Negative enthalpy change in an isobaric and isentropic process. It must be spontaneous for an adiabatic process to occur under conditions of constant volume and rising system entropy.

Hence, the correct option is a and d.

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Which of the following process must be spontaneous?