Match the following processes with entropy change:

Reaction Entropy change
(i) A liquid vapourises (a) \Delta S = 0
(ii)Reaction is non-spontaneous at all temperatures and \Delta H is positive (b) \Delta S =      Positive
(iii) Reversible expansion of an ideal gas \Delta S = negative

 

Answers (1)

(i) - b

(ii) - c

(iii) -a

Explanation:

Reaction

Entropy change

(i) A liquid vaporises

As a liquid change to gaseous state, the movement of molecules will increase and hence the entropy will also increase.

ii) Reaction is non-spontaneous at all temperatures and AH is positive.

ΔG is positive as the process in non-spontaneous. Also, ΔH is positive. Hence, ΔS is negative.

(iii) Reversible expansion of an ideal

gas

This process at every stage is always in equilibrium

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