Which of the following is a true statement [ \( \mathbf{J} \& \) K ...

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Which of the following is a true statement [ \( \mathbf{J} \& \) K CET 2012]
(a) The total entropy of thermally interacting systems is
\( \mathrm{P} \) conserved
(b) Carnot engine has \( 100 \% \) efficiency
W
(c) Total entropy does not change in a reversible process
(d) Total entropy in an irreversible process can either increase or decrease
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