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A reaction A +B rarr C+D +q is found to ...

A reaction `A +B rarr C+D +q` is found to have a positive entropy change, the reaction will be:

A

possible at high temperature

B

possible only at low temperature

C

not possible at any temperature

D

possible at any temperature

Text Solution

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For a ractions to be spontaneous, `DeltaG` should be negative.
`DeltaG=DeltaH-DeltaS`
According to the question, for the given, reaction,
`DeltaS`= positive
`DeltaH` =negative (since heat is evolved)
`rArrDeltaD`= negative
Therefore, the reactions is spontaneous at any temperature.
Hence, alternative (iv) is correct.
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