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Which of the following sets of condition...

Which of the following sets of conditions would result in a reaction that is spontaneous at high temperature but non-spontaneous at low temperature?

A

`DeltaH gt 0`, `DeltaS gt 0`

B

`DeltaH lt 0`, `DeltaS gt 0`

C

`DeltaH gt 0`, `DeltaS = 0`

D

`DeltaH lt 0`, `DeltaS lt 0`

Text Solution

Verified by Experts

The correct Answer is:
D
Reaction is exothermic because it is spontaneous at low temperature but non spontaneous at high temperature. As spontaneity depends upon temperature, the two factors oppose each other.
i.e. `DeltaH=-ve` and `-TDeltaS=+ve` or `DeltaS` is `-ve` so `DeltaG` is `+ve` at higher temperatures.
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