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Predict in which of the following entrop...

Predict in which of the following entropy of the system increases`//`decreases:
(P) A liquid crystalizes into a solid
(Q) Temperature of a crystalline solid is raised
(R ) `2NaHCO_(3)(s)toNa_(2)CO_(3)(s)+H_(2)O(g)+CO_(2)(g)`
(S) `H_(2)(g)to2H(g)`

Text Solution

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(i) Decreases because a solid has ordered arrangement of constituent particles.
(ii) Increases because at 0K,there is a perfect order of constituent particles. As temperature is increased , the particle start vibrating about their equilibrium position. Hence, a disorder sets in.
(iii)Increases because the reactant is solid whereas products have gaseous substances.
(iv) Increases because the products havelarger (double) number of particles.
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