WAEC Chemistry 2011 Objective — Question 33

Question 33 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Consider the following reaction equation: X(g)+Y(g)⇌XY(g); ΔH=+220kJmol⁻¹. If the temperature of the system is increased, the

A. A. backward reaction would be favoured
B. B. forward reaction would be favouredCorrect
C. C. reaction would stop
D. D. reaction would be at equilibrium

Explanation

The positive ΔH shows the forward reaction is endothermic. An increase in temperature favours the endothermic (forward) reaction, while a decrease favours the exothermic (backward) reaction.

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