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What is the change in internal energy for a process which has final and initial states are exactly similar?

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What is the change in internal energy for a process which has final and initial states are exactly similar?

(a) Positive

(b) Negative

(c) Zero

(d) Cannot say

This question was addressed to me in examination.

My query is from Internal Energy and Energy Conversion Concept topic in section Introduction to Energy Balances for Processes without Reaction and Calculation of Enthalpy Changes of Basic Chemical Engineering

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The correct choice is (c) Zero

To explain: Since internal energy is a state function, change in internal energy for the process will be zero.

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