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

Question

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

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`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - 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.

4 views Answered 2023-02-05 15:29