Q.

Which of the following statements are always correct?

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a

The entropy change of surrounding is always zero in adiabatic process.

b

The entropy change of a system participating in adiabatic irreversible process is al ways positive

c

The entropy change of a system participating in adiabatic process is always positive.

d

The entropy change of a system participating in adiabatic process is always zero.

answer is B, C.

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Detailed Solution

The entropy change of a system participating in adiabatic process is always zero when not heat is entered or leaves during the process. 

It is not always correct. It can be positive, negative or zero.

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