The criterion for a spontaneous process is

Options

A. `DeltaGgt0`
B. `DeltaGlt0`
C. `DeltaG=0`
D. `DeltaS_(Total)lt0`

Answer

B

Explanation

The criterion for a spontaneous process is `DeltaG lt 0`
Gibbs free energy is the maximum amount of energy available to a system during a process, that can be converted into useful work.
`DeltaG=DeltaH-TDeltaS`
It is called Gibbs-Helmholtz equation and useful in predicting the spontaneity of process.
If `DeltaG=-ve`, the process is spontaneous.
If `DeltaG= +ve`, the process is non-spontaneous.
If `DeltaG = zero`, the process is in equilibrium.