Question

For a reaction to occur spontaneously

• A. ( $\Delta$ H-T$\Delta$ S) must be negative
• B. ( $\Delta$ H+T$\Delta$S) must be negative
• C. $\Delta$ H must be negative
• D. $\Delta$ S must be negative

Answer 1

The correct option is A ( $\Delta$ H-T$\Delta$ S) must be negative

For a spontaneous process $\Delta G$ should be negative
$\Delta G=\Delta H-T\Delta S$
Thus $\Delta H-T\Delta S$ will be negative