First slide

2nd Law of Thermodynaimcs

Question

The process which is accompanied with decrease in entropy is

Moderate

A

Evaporation of water
B

Formation of Nitric oxide from its elements
C

Formation of Calcium carbonate from quick lime and carbon dioxide
D

Decomposition of liquid water into its elements

Solution

$CaO (s) + {CO}_{2} (g) \overset{∆}{\to} {CaCO}_{3} (s);$
Number of gaseous moles decreases during the process thus randomness decreases.
$∴∆S=-ve$ ;
1…. $H_{2} O (l) \to H_{2} O (g) . . . ∆ S = + ve;$
2… $N_{2} (g) + O_{2} (g) \to 2 NO (g) . . . ∆ S = 0;$
4… $H_{2} O (l) \to H_{2} (g) + \frac{1}{2} O_{2} (g) . . . ∆ S = + ve;$

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