Q. For the reaction, $H_2(g)+I_2(g)\rightleftharpoons2HI(g)$ Attainment of equilibrium is predicted correctly by :
A) [image:2025J24S2_Q58_opt_a.png]
B) [image:2025J24S2_Q58_opt_b.png]
C) [image:2025J24S2_Q58_opt_c.png]
D) [image:2025J24S2_Q58_opt_d.png]
Explanation
[Solution by Dr. Abubacker] Starting from $H_2$ and $I_2$ with no $HI$, the concentrations of $H_2$ and $I_2$ fall (equally, as the stoichiometry is 1:1) while $HI$ rises from zero, and all three become constant at equilibrium. Only option (2) shows both reactant curves decreasing and the $HI$ curve increasing to a plateau. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.