First slide

2nd Law of Thermodynaimcs

Question

For the reaction, $2 Cl (g) \to {Cl}_{2} (g)$ , the correct option is :

Moderate

A

$Δ_{r} H > 0 and Δ_{r} S < 0$
B

$Δ_{r} H < 0 and Δ_{r} S > 0$
C

$Δ_{r} H < 0 and Δ_{r} S < 0$
D

$Δ_{r} H > 0 and Δ_{r} S > 0$

Solution

$2 {Cl}_{(g)} \to {Cl}_{2} (g)$
As it involves bond formation, reaction is an Exothermic reaction
$(ΔH = - ve) and {Δn}_{g} = - 1$
Entropy decreases. $∆ S < 0$

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