Q. For which of the following reactions, $K_{p} = K_{c}$?
A) $N_{2} + 3H_{2} \rightleftharpoons 2NH_{3}$
B) $N_{2} + O_{2} \rightleftharpoons 2NO$
C) $PCl_{5} \rightleftharpoons PCl_{3} + Cl_{2}$
D) $2SO_{3} \rightleftharpoons 2SO_{2} + O_{2}$
Explanation
(b)
$K_{p} = K_{c}(RT)^{\mathrm{\Delta}n}$
For the reaction,
$N_{2} + O_{2} \rightleftharpoons 2NO$
$\mathrm{\Delta}n = 2 - 2 = 0$
$\therefore$ $K_{p} = K_{c}(RT)^{0}$
$K_{p} = K_{c}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.