An endotthermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then:

Options

A. `Delta H` is -ve, `Delta S` is + ve
B. `Delta H and Delta S` both are + ve
C. `Delta H and Delta S` both are - ve
D. `Delta H` is + ve, `Delta S` is - ve

Answer

B

Explanation

For a reaction to be spontaneous, `Delta G` must be negative. According to the equation -
`Delta G = Delta H- T. Delta S`
If `Delta H and DeltaS` both are positive, than term T. `Delta S` will be greater than `DeltaH` at high temperature and consequently `Delta G` will be negative at high temperature.