JAMB Chemistry 2010 Objective — Question 30

Question 30 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

30. 2H2(g) + O2(g) <-> 2H2O(g) delta H = -ve. What happens to the equilibrium constant of the reaction above if the temperature is increased? A. It decreases B. It increases C. It is unaffected D. It becomes zero

A. It decreasesCorrect
B. It increases
C. It is unaffected
D. It becomes zero

Explanation

Since the reaction is exothermic, an increase in temperature will favour the backward (endothermic) reaction. Thus, the value of K decreases.

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