Question

If enthalpy is negative and entropy is positive, the free energy is:

• A. negative at lower temperatures
• B. always negative
  
• C. never negative
  
• D. negative at high temperatures
• E. constant

Answer 1

Answer: (B)

always negative

If enthalpy is negative and entropy is positive, the free energy change is always negative.
$\Delta G=\Delta H-T\Delta S=-ve-T\times +ve=-ve+-ve=-ve$
Negative free energy change corresponds to spontaneous reaction.