Question

Which from following is NOT a state function ?

• A. Volume
• B. Pressure
• C. Work
• D. Temperature

Hint:

A state function depends only on the initial and final states, not on the path taken.

Answer 1

The Correct Option is C

Step 1: Understand the concept
A state function has a value fixed by the present state of the system. Its change depends only on the initial and final states and never on the route.

Step 2: Check the state variables
Volume, pressure and temperature are properties that describe the state of a system. Each has a definite value for a given state, so each is a state function.

Step 3: Check work
Work depends on how the change is carried out. For example, expanding a gas from \(V_1\) to \(V_2\) reversibly gives more work than expanding it against a smaller constant pressure. The same end states give different work, so work is a path function.

Step 4: Conclusion
Only work is not a state function. Heat is also a path function, but it is not listed.

Final Answer:
Work depends on the path, so it is not a state function. This is option (C). \[ \boxed{\text{(C) }\text{Work}} \]