Question

A reaction occurs spontanecously if `:-`
A. `TDeltaS lt DeltaH` and both `DeltaH and DeltaS` are +ve
B. `TDeltaS gt DeltaH` and both `DeltaH and DeltaS` are +ve
C. `TDeltaS = DeltaH` and both `DeltaH and DeltaS` are +ve
D. `TDeltaS gt DeltaH and DeltaH` is +ve and `DeltaS` is -ve

Answer 1

Correct Answer - B
The spontaneity of a reaction is based upon the negative value of `DeltaG and DeltaG` is based upon T, `DeltaS and DeltaH` according to following equation (Gibbs Helmholtz equation)
`DeltaG=DeltaH-TDeltaS`
If the magnitude of `DeltaH-TDeltaS`
If the magnitude of `DeltaH-TDeltaS` is negative, then the reaction is spontaneous
when `TDeltaS gt DeltaH` or we can say that `DeltaH` and `DeltaS` are positive , then `DeltaG` is negative.