Which of the following statement is true?

Options

A. `DeltaG` is always greater than `DeltaH`
B. `DeltaG` is always less than `DeltaH`
C. `DeltaG` may be lesser or greater or equal to `DeltaH`
D. `DeltaG` is always proportional to `DeltaH`

Answer

C

Explanation

According to Gibb.s Helmholtz equation, chanage in free energy `DeltaG=DeltaH-TDeltaS`. For a spontaneous process. `DeltaG` must be negative Therefore, `DeltaG` may be greater, smaller or equal to `DeltaH` depending on sign and magnitude of `TDeltaS`.