A chemical reaction cannot occur at all if its

Options

A. `DeltaH` values is positive and `DeltaS` value if negative
B. `DeltaH` value is negative and `DeltaS` value is positive
C. `DeltaH` and `DeltaS` values are negative but `DeltaH lt TDeltaS`
D. `DeltaH` and `DeltaS` values are positive but `DeltaH lt T DeltaS`

Explanation

To determine under what conditions a chemical reaction cannot occur at all, we need to analyze the Gibbs free energy change (ΔG) for the reaction. A reaction is non-spontaneous if ΔG is greater than zero (ΔG > 0).

### Step-by-Step Solution:

1. **Understand Gibbs Free Energy (ΔG)**:
The Gibbs free energy change is given by the equation:
\[
\Delta G = \Delta H - T \Delta S
...