A reaction occurs spontaneously if:

Options

A. `T Delta S lt Delta H` and both `Delta H` and `Delta S` are `+ ve`
B. `T Delta S gt Delta H` and both `Delta H` and `Delta S` are `+ ve`
C. `T Delta S = Delta H` and both `Delta H` and `Delta S` is `+ ve`
D. `T Delta S lt Delta H` and `Delta H` is `+ ve` and `Delta S` is `-ve`

Answer

B

Explanation

According to thermodynamics,
`Delta G = Delta H - T Delta S`
If both `Delta H` and `Delta S` are positive, then `Delta G` will be negative only when the `T Delta S` term is greater in magnitude than `Delta H`.