1.

If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point then

Answer»

`DeltaH` is -ve, `DELTAS` is + ve
`DeltaH` and `DeltaS` both are + ve
`DeltaH` and `DeltaS` both are -ve
`DeltaH` is +ve, `DeltaS` is -ve

Solution :For a reaction to be SPONTANEOUS, `DELTAG` must be negative, According to the equation -
`DeltaG=DeltaH-T.DeltaS`
If `DeltaH` and `DeltaS` both are positive, than term T. `DeltaS` will begreater than `DeltaH` at high temperature and consequently `DeltaG` will be negative at high temperature.


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