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The thermodynamic state of a closed system containing a pure fluid changes from (T1, p1) to (T2, p2), where T and p denote the temperature and pressure, respectively. Let Q denote the heat absorbed (> 0 if absorbed by the system) and W the work done (> 0 if done by the system). Neglect changes in kinetic and potential energies. Which one of the following is CORRECT?
Options:
A .  Q is path-independent and W is path-dependent
B .  Q is path-dependent and W is path-independent
C .  (Q − W) is path-independent
D .  (Q + W) is path-independent
Answer: Option C


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