MCQ
A reaction, $A+B \rightarrow C+D+q$ is found to have a positive entropy change. The reaction will be
- Apossible at high temperature
- Bpossible only at low temperature
- Cnot possible at any temperature
- ✓possible at any temperature
✓
Answer
Correct option: D.
possible at any temperature
d
For a reaction to be spontaneous, $\Delta G$ should be negative.
For a reaction to be spontaneous, $\Delta G$ should be negative.
$\Delta G=\Delta H-T \Delta S$
According to the question, for the given reaction,
$\Delta S=$ positive
$\Delta H=$ negative (since heat is evolved)
$\Rightarrow \Delta G=$ negative
Therefore, the reaction is spontaneous at any temperature.
Hence, alternative $(iv)$ is correct.
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