WAEC Chemistry 2011 Paper

Concept:Le Chatelier's principle explains how the equilibrium position responds to a change in temperature.Explanation:For an endothermic reaction, $\Delta H > 0$.Increasing the temperature adds heat to the system.The equilibrium shifts in the direction that absorbs heat, which is the forward reaction.Therefore, more product is formed and the forward reaction is favoured.For an exothermic reaction, $\Delta H < 0$, an increase in temperature would favour the backward reaction instead.Since the given reaction is endothermic with $\Delta H = +$, the forward reaction is favoured.Answer:Option B — forward reaction would be favoured.