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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Thermodynamics
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Which of the following statements is true?

$\begin {array} {1 1} (A)\;\text{Spontaneous reactions never require initiation.} \\ (B)\;\text{Negative value of $ \Delta S$ is the sole criterion of spontaneity.} \\ (C)\; \text{2nd law of thermodynamics tells that entropy of universe is constant.} \\ (D)\;\text{The dissociation of ammonium chloride involves an increase in randomness.} \end {array}$

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Dissociation of ammonium chloride produces ammonia and chlorine, so entropy, or randomness increases with increase in number of molecules.
Ans : (D)
answered Mar 17, 2014 by thanvigandhi_1
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