A spontaneous change is one in which a system under goes

Options

A. `T_(e)gtT`
B. `TgtT_(e)`
C. `T_(e)` is `5` times `T`
D. `T=T_(e)`

Answer

D

Explanation

`DeltaG=DeltaH-TDelatS`
Here, `DeltaG`=Gibbs's free energy
`DeltaH`=Enthalpy change
`DeltaS`= Enthalpy change
`T`= Temperature
As equilibrium, `DeltaG=0` Thus, `TDeltaS=DeltaH` , as `DeltaH` and `DeltaS` are `+ve` , for a reaction to be feasible (spontaneous), `DeltaG` should be `-ve` . This can be possible only when
`TDeltaSgt T_(e),DeltaH` , i.e., `TDeltaSgt T_(e)DeltaS`
or `Tgt T_(e)[T_(e)` =temperature at equilibrium]