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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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