Q.
The equilibrium constant, $K$ for the reaction
$2HI(g) \rightleftharpoons H_{2}(g) + I_{2}(g)$
At room temperature is 2.85 and that at 698 K, it is $1.4 \times 10^{- 2}$. This implies that
A) HI is resonance stabilised
B) HI is exothermic compound
C) HI is stable at room temperature
D) HI is less stable than $H_{2}$ and $I_{2}$
Explanation
(d)
Decrease of $K$ with rise of temperature means that the forward reaction is exothermic. As the given reaction is exothermic, energy of HI is greater or stability is less than $H_{2}$and $I_{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.