First slide

2nd Law of Thermodynaimcs

Question

Entropy is a very important thermodynamic property. Change in entropy is positive in the following process

Moderate

A

Condensation of water
B

Formation of acetylene from its constituent elements
C

Contraction of gas at constant temperature
D

Decomposition of potassium chlorate

Solution

1. $H_{2} O (g) \to H_{2} O (l); ΔS = - ve$
2. $2 C (s) + H_{2} (g) \to C_{2} H_{2} (g); ΔS = 0$
3. Contraction of gas at const. T, volume ↓ $ΔS = - ve$
4. $2 {KClO}_{3} (s) \to 2 KCl (s) + 3 O_{2} (g); ΔS = + ve$

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