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Q.

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is

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a

ΔH<0 and ΔS>0

b

ΔH<0 and ΔS<0

c

ΔH<0 and ΔS=0

d

ΔH>0 and ΔS<0

answer is A.

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Detailed Solution

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Option-1 is correct:

ΔG=ΔH-TΔS

 If ΔH<0 and ΔS>0ΔG=(-ve)-T(+ve)

 then at all temperaturesΔG=-ve, spontaneous reaction

Also, option-3 also correct:

 If ΔH<0 and ΔS=0

ΔG=(-ve)-T(0)=-ve at all temperatures. 

Basically, this question has two correct options-1 and 3. Also, according to answer key published by NTA , 1 and 3 are correct answers.

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