Which of the following factors will initially increase the forward rate of the following exothermic reaction? Xfor⇌revY+heat I. Increasing the temperature II. Increasing the concentration of X III. Adding a catalyst
A
I, II, and III
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B
I and II only
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C
II and III only
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D
I only
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Solution
The correct option is C II and III only The given reaction is exothermic. So, by Le Chatelier's principle, the decrease in temperature will favour forward reaction.
X⇌Y+heat
If a concentration of X is increased then by Le Chatelier's principle, to compensate for this increase, the forward reaction is favoured. The addition of catalysts initially increases the forward reaction.