The incorrect statement(s) among the following statements is/are -

(i) When liquid crystallizes into a solid, entropy increases.
(ii) When the temperature of a crystalline solid is raised from 0 K to 115 K then entropy increases.
(iii) 2 NaHCO3 (s) →Na2CO(s) +CO2(g)+H2O(g); Entropy  increases.
(iv) H2(g)→2H(g) ; Entropy  decreases.


1. (i), (iv)
2. (ii), (iv)
3. (iii), (iv)
4. (i), (iii)

Subtopic:  Spontaneity & Entropy |
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For the oxidation of iron,

4Fe(s) + 3O2 (g) →  2Fe2O3 (s)
entropy change is -549.4 JK-1 mol-1 at 298 K.

(rHΘ for this reaction is -1648 × 103 J mol-1)

The reaction is:

1. Spontaneous reaction

2. Non-spontaneous reaction

3. Reaction is an equilibrium

4. Cannot predict

Subtopic:  Spontaneity & Entropy |
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