| Which of the following are not state functions? [AIPMT (S) 2008] |
| (I) \[q+W\] (II) q |
| (III) W (IV) H-TS |
A) (I) and (IV)
B) (II), (III) and (IV)
C) (I), (II) and (III)
D) (II) and (III)
Correct Answer: D
Solution :
| Key Idea: State function is the property of the system whose value depends only on the initial and final state of the system and is independent of the path. |
 Internal energy  |
| It is a state function because it is independent of the path. It is an extensive property. |
| Gibbs energy (G) = H - TS |
| It is also a state function because it is independent of the path. It is also an extensive property. |
| Heat (q) and work (W) are not state functions being path dependent. |
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