Discussion
In an irreversible process taking system and surroundings together the change in entropy (ΔS) is
Answer: B
For an irreversible process, \(\Delta S \gt 0\): the total entropy increases.
The second law of thermodynamics says that the total entropy of a system and its surroundings never decreases. It stays constant only in an ideal reversible process and increases in every real, irreversible one, such as heat flowing across a finite temperature difference or a gas expanding freely.
So ΔS = 0 describes a reversible process, ΔS below zero is impossible for the system and surroundings together, and 'None of these' is wrong.
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