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.