Discussion
Assertion (A): The entropy change between two states can be computed along a reversible path even when the actual process was irreversible.
Reason (R): Entropy is a state function, so its change depends only on the end states.
Answer: C
Both are true and the reason gives the licence: the irreversible path itself gives no usable integral, so a convenient reversible path is invented purely to evaluate the difference. The generated entropy is then found from the balance instead.
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