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+2 votes
43.6k views
in Chemistry by (73.1k points)

In which case change in entropy is negative?

(1)   Evaporation of water

(2) Expansion of a gas at constant temperature

(3)   Sublimation of solid to gas 

(4)   2H(g)  H2(g)

1 Answer

+2 votes
by (69.1k points)
selected by
 
Best answer

Correct option (4)   2H(g)  H2(g)

Explanation:

•  H2O (l)  H2O(v) , ΔS > 0

• Expansion of gas at constant temperature, ΔS > 0

•  Sublimation of solid to gas, ΔS > 0

•  2H(g) → H2(g), ΔS < 0 (∴ Δng < 0)

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