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Predict the sign of entropy change in each of the following: 

(i) A liquid crystallizes into solid. 

(ii) Temperature of perfectly crystalline solid is raised from 0 K to 115 K. 

(iii) 2NaHCO3 (s) → Na2CO3 (s) + H2O(g) 

(iv) H2 (g) → 2H(g).

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(i) Negative

(ii) Positive

(iii) Positive because gaseous product is formed

(iv) Positive

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