Q. A reaction occurs spontaneously if :
A) TΔS < ΔH and both ΔH and ΔS are +ve
B) TΔS > ΔH and both ΔH and ΔS are +ve
C) TΔS = ΔH and both ΔH and ΔS are +ve
D) TΔS > ΔH and ΔH is +ve and ΔS is −ve
Explanation
[Solution from source] ΔG = ΔH − TΔS. When ΔH and ΔS are both positive, ΔG < 0 only when TΔS > ΔH. With ΔH positive and ΔS negative, ΔG is always positive. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.