Post-UTME Chemistry 2017 Objective — Question 8

Question 8 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2017 Objective paper, with the correct answer and a full explanation.

N2(g) + O2(g) <=> 2NO(g), delta H + 92kJ. The equilibrium represented by the above equation can be shifted to right by

A. decreasing the temperature
B. using a catalyst
C. increasing the pressure
D. using excess nitrogenCorrect

Explanation

Adding excess N2 (a reactant) shifts the equilibrium to the right (Le Chatelier's principle); the reaction is endothermic, so cooling would not help, and pressure has no effect since moles of gas are equal on both sides.

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