question_answer

Equilibrium constant K changes with temperature. At 300 K, equilibrium constant is 25 and at 400 K it is 10. Hence, backward reaction will have energy of activation

A) equal to that of forward reaction.

B) less than that of forward reaction.

C) greater than that of forward reaction.

D) given values are not sufficient to explain given statement.

Correct Answer: C

Solution :

[c] K decreases with increase in temperature. Thus, forward reaction is exothermic. \[{{E}_{a}}=\] activation energy of forward reaction \[{{E}_{a}}'=\]... backward...       \[=({{E}_{a}}+\Delta H)\] Thus, \[E_{a}^{'}>{{E}_{a}}\]