If the question seems rather "unscientific", be kind to accept my apology. My textbook is being highly unclear about the topic and I need to know the answer to this question before I go on with my studying.
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1$\begingroup$ Sure, in any trivial reaction involving the reformation of the reactants. Entropy is a state function and if you reform the reactants then the change in entropy is 0. $\endgroup$– DissenterAug 12, 2014 at 15:56
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$\begingroup$ So then zero entropy change can hardly be found in biphasic mixtures, huh? $\endgroup$– M.A.R.Aug 12, 2014 at 16:05
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Yes, entropy change of reversible process is zero.
answered Aug 13, 2014 at 5:20
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1$\begingroup$ Yeah, but there's no such thing like reversible process in real world... $\endgroup$– MithoronApr 14, 2015 at 13:38