Question

Which of the following is most likely to produce a spontaneous reaction?

• A. Negative Enthalpy
• B. Positive Enthalpy
• C. Negative Entropy
• D. Positive Entropy
• E. Negative Enthalpy and positive Entropy

Answer 1

The correct option is E Negative Enthalpy and positive Entropy

For the spontaneous reaction, the negative enthalpy and positive entropy is most likely.
As for spontaneous reaction the value of $\Delta G$ must be negative.
Hence, as per formula,
$\Delta G=\Delta H-T\Delta S$,
So, if $\Delta H$ and $\Delta S$ are negative and positive respectively then the value of the $\Delta G$ must be negative whatever the temperature.