Question:
Which is not a state function?
Which is not a state function?
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Work and heat are path functions, while internal energy, entropy and enthalpy are state functions.
Updated On: May 19, 2026
- Work
- Internal energy
- Change in entropy for reversible process
- Enthalpy
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The Correct Option is A
Solution and Explanation
Concept:
A state function depends only on the initial and final states of a system, not on the path followed.
Step 1: Check internal energy.
Internal energy is a state function. \[ \Delta U \text{ depends only on initial and final states} \]
Step 2: Check entropy.
Entropy is also a state function. \[ \Delta S \text{ depends only on initial and final states} \]
Step 3: Check enthalpy.
Enthalpy is a state function. \[ H=U+PV \]
Step 4: Check work.
Work depends on the path followed during the process. Therefore, work is not a state function. \[ \therefore \text{Correct Answer is (A)} \]
A state function depends only on the initial and final states of a system, not on the path followed.
Step 1: Check internal energy.
Internal energy is a state function. \[ \Delta U \text{ depends only on initial and final states} \]
Step 2: Check entropy.
Entropy is also a state function. \[ \Delta S \text{ depends only on initial and final states} \]
Step 3: Check enthalpy.
Enthalpy is a state function. \[ H=U+PV \]
Step 4: Check work.
Work depends on the path followed during the process. Therefore, work is not a state function. \[ \therefore \text{Correct Answer is (A)} \]
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