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Question

The signs of H, S and G for a non-spontaneous reaction at all temperatures would be:

A
+, +, -
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B
+, -, +
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C
-, -, -
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D
+, +, +
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Solution

The correct option is B +, -, +
ΔH<0, ΔS>0 Spontaneous at any temperature.
ΔH>0, ΔS<0 Non-spontaneous regardless of the temperature.
ΔH>0, ΔS>0 Spontaneous at certain temperature range.
ΔH<0, ΔS<0 Spontaneous at certain temperature range.

ΔG<0 In order for reaction to be Spontaneous at given temperature.
ΔG>0 In order for reaction to be Non-Spontaneous at given temperature.

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