During which of the following processes, does entropy decrease ?
(A) Freezing of water to ice at $0 ° C$
(B) Freezing of water to ice at $- 10 ° C$
(C) ${N}_{2} ( g ) + 3{H}_{2} ( g ) \to 2{NH}_{3} ( g )$
(D) Adsorption of $CO ( g )$ and lead surface
(E) Dissolution of $NaCl$ in water

Question

During which of the following processes, does entropy decrease ?

(A) Freezing of water to ice at $0 ° C$
(B) Freezing of water to ice at $- 10 ° C$
(C) ${N}_{2} ( g ) + 3{H}_{2} ( g ) \to 2{NH}_{3} ( g )$
(D) Adsorption of $CO ( g )$ and lead surface
(E) Dissolution of $NaCl$ in water

Quantrex Academy · Accepted Answer

Correct answer: A. (A), (B),(C) and (D) only

(A) Water 0 ° C ⟶ ice; = - ve (B) Water - 10 ° C ⟶ ice; = - ve (C) N _ 2 ( g ) + 3 H _ 2 ( g ) → 2 NH _ 3 ( g ) ; = - ve (D) Adsorption; = - ve (E) NaCl ( s ) → Na ^ + ( aq ) + Cl ^ - ( aq ) ; = + ve

During which of the following processes, does entropy decrease ?...

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