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

$$\begin{gathered} \mathrm{\Delta G}=\mathrm{\Delta H}-\mathrm{T\Delta S} \\ \mathrm{Since} \mathrm{\Delta G}=\mathrm{\Delta H}-\mathrm{T\Delta S} \mathrm{foranendothermicreaction}, \\ \mathrm{\Delta H}=+ \mathrm{veandatlowtemperature} \mathrm{\Delta S}=+\mathrm{ve} \\ \mathrm{Hence} \mathrm{\Delta G}=(+)\mathrm{\Delta H}-\mathrm{T}(+)\mathrm{\Delta S} \\ \mathrm{andif} \mathrm{T\Delta S}<\mathrm{\Delta H} (\mathrm{at} \mathrm{low} \mathrm{temp}) \\ \mathrm{\Delta G}=+\mathrm{ve} (\mathrm{non} \mathrm{spontaneous}) \\ \mathrm{But} \mathrm{at} \mathrm{high} \mathrm{temperature}, \mathrm{reaction} \mathrm{becomes} \\ \mathrm{spontaneousi}.\mathrm{e}. \mathrm{\Delta G}=- \mathrm{ve}. \\ \mathrm{becauseathighertemperature} \mathrm{T\Delta S}>\mathrm{\Delta H}. \end{gathered}$$