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Question

Chemistry Question on Thermodynamics

In which case change in entropy is negative ?

A

Sublimation of solid to gas

B

2H(g)→H2(g)2H(g) \rightarrow H_2(g)

C

Evaporation of water

D

Expansion ofa gas at constant temperature

Answer

2H(g)→H2(g)2H(g) \rightarrow H_2(g)

Explanation

Solution

∙\bullet H2P(ℓ)<=>H2O(v),ΔS>0{H_2P (\ell) <=> H_2O({v}) , \Delta S > 0 }
∙\bullet Expansion of gas at constant temperature, Δ\DeltaS > 0
∙\bullet Sublimation of solid to gas , ΔS>0\Delta S > 0
∙\bullet 2H(g)−>H2(g),ΔS<0(∵Δng<0){2H(g) -> H_2(g), \Delta S < 0 (\because \Delta n_g < 0 )}