A chemical reaction cannot occur at all if its

Options

A. `DeltaH` is `+ve` and `DeltaS` is `-ve`
B. `DeltaH` is `-ve` and `DeltaS` is `+ve`
C. `DeltaH` and `DeltaS` are `+ve` but `DeltaH gt DeltaS`
D. `DeltaH` and `DeltaS` are `-ve` but `DeltaH gt DeltaS`

Answer

C

Explanation

A reaction in which `DeltaH` is `+ve` and `DeltaS` is `-ve` cannot occur at all as its `DeltaG` is always `+ve`
`DeltaH=DeltaH-TDeltaS`
`=(+ve)-(+ve)(-ve)`
`=+ve+ve=+ve`