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Which of the following are not state functions? (I) q + w (II) w (III) H - TS

1. (I) and (IV)
2. (II), (III) and (IV)
3. (I), (II) and (III)
4. (II) and (III)

Correct answer: (II) and (III)

Solution

State functions depend only on the state of the system, not the path taken. Work (w) is path-dependent, so it is not a state function. H - TS is a state function as it depends on state variables. Thus, (II) is not a state function.

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