Question

Match List I (Equations) with List II (Types of process) and select the correct option.

List-I (Equations)		List-II (Types of process)
A.	$K_p>Q$	1.	Non-spontaneous
B.	$\Delta G^{\circ }<RTInQ$	2	Equilibrium
C.	$K_p=Q$	3	Spontaneous and endothermic
D.	$T>\frac{\Delta H}{\Delta S}$	4	Spontaneous

• A. (A) $\to$ 1 ,(B) $\to$ 2 ,(C) $\to$ 3 ,(D ) $\to$ 4
• B. (A) $\to$ 3 ,(B) $\to$ 4 ,(C) $\to$ 2 ,(D ) $\to$ 1
• C. (A) $\to$ 4 ,(B) $\to$ 1 ,(C) $\to$ 2 ,(D ) $\to$ 3
• D. (A) $\to$ 2 ,(B) $\to$ 1 ,(C) $\to$ 4 ,(D ) $\to$ 3

Answer 1

Answer: (C)

(A) When $K_P>Q$, the reaction goes in forward direction, i.e., the reaction is spontaneous.
(B) Given, $\Delta G^{\circ }<RT\ln Q$
thus, $\Delta G^{\circ }=+$ ve
and hence, the reaction is non-spontaneous.
(C) At equilibrium, $K_P=Q$
(D) $T>\frac{\Delta H}{\Delta S}$
or $T\Delta S>\Delta H$
This condition is true for spontaneous endothermic reactions (as $\Delta G\ge \Delta H-T\Delta S)$