The equilibrium constant K for the reaction : 2HI(g) H_2 (g) + I_… - Vidyadip

MCQ

The equilibrium constant $K$ for the reaction : $\ce{2HI(g) \rightleftharpoons H_2(g) + I_1(g)}$ at room temp is $2.85$ and that at $698 K$ is $1.4 \times 10 − 2$. This implies that the forward reaction is:

✓
Exothermic.
B
Endothermic.
C
Exergonic.
D
Unpredictable.

✓

Answer

Correct option: A.

Exothermic.

With the increase of temperature, $k$ value decreases, so that forward reaction decreases with increase of temperature. This implies that reaction will proceed in forward direction with decrease of temperature, i.e., heat is liberated and hence forward reaction is exothermic.

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