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Q.

Which of the following conditions may lead to a non-spontaneous change?

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a

ΔH and ΔS both + ve

b

ΔH=−ve;ΔS=+ve

c

ΔH=+ ve ;ΔS=− ve

d

ΔH=− ve ;ΔS=− ve

answer is A.

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Detailed Solution

ΔG=ΔH−TΔS(1) ΔH=+ ve ,ΔS=+ ve at low temperature  ΔG=+ ve (2) ΔH=−ve,ΔS=+ve;ΔG=−ve at any temperature. (3) ΔH=+ ve ,ΔS=− ve ,ΔG=+ve at any temperature.(4) ΔH=− ve ,ΔS=− ve, ΔG=+ ve at high temperature.
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Which of the following conditions may lead to a non-spontaneous change?