Entropy change estimation of any irreversible process - Thermodynamics

Q.  How is the entropy change of any irreversible process estimated, when the process is connecting two equilibrium points A and B?
- Published on 19 Aug 15

a. by replacing the original process by reversible zigzag path containing reversible adiabatic followed by isothermal and then again reversible adiabatic process between the same equilibrium points A and B
b. by replacing a reversible path between the same equilibrium points A and B
c. both a. and b.
d. none of the above

ANSWER: by replacing a reversible path between the same equilibrium points A and B

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