Q. Which of the following is not a physical equilibrium?
A) $Ice \rightleftharpoons Water$
B) $I_{2}(s) \rightleftharpoons I_{2}(g)$
C) $S(l) \rightleftharpoons S(g)$
D) $3O_{2} \rightleftharpoons 2O_{3}$
Explanation
(d)
$3O_{2}(g) \rightleftharpoons 2O_{3}(g)$
$O_{2}\ and\ O_{3}\$are the allotropes of oxygen, i.e., have different composition, so the equilibrium exist between them is considered as chemical equilibrium.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.