Which of the following is always feasible ?

Options

A. `DeltaH = T Delta S`
B. `DeltaH (+ve) , T DeltaS (-ve) and Delta H gt T Delta S`
C. `Delta H (-ve) , T DeltaS (+ve) and DeltaH lt T Delta S`
D. `Delta Hb(-ve) , T DeltaS (-ve) and DeltaH lt T DeltaS`

Answer

C

Explanation

Feasibility of reaction is determined by free energy change value `(DeltaG)` . `DeltaG` is given by gibbs-Helmhots equation:
`DeltaG=DeltaH-T DeltaS`
Reaction is feasible if `DeltaG` value is negative . Therefore, if `DeltaH` is negative and `T DeltaS` is positive then the `DeltaG` will always be feasible .