A) exothermic
B) endothermic
C) exergonic
D) unpredictable
Correct Answer: A
Solution :
Key Idea: Write expression for equilibrium, constant and apply Le-Chateliers principle \[2HI{{H}_{2}}(g)+{{I}_{2}}(g)\] \[k=\frac{[{{H}_{2}}]\,[{{I}_{2}}]}{{{[HI]}^{2}}}\] When temperature increases, \[{{K}_{c}}\] decreases. \[\therefore \] Concentration of product decreases. It means forward reaction is not favoured at - higher temperature. This is true for exothermic reactions. So, the forward reaction is exothermic.You need to login to perform this action.
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