JAMB Chemistry 2007 Objective — Question 28

Question 28 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

H3PO4(aq) + H2O(l) <=> H2PO4- + H3O+, delta H = -13kJ at 298K. In the reaction above, an increase in temperature would favour

A. the forward reaction
B. the reverse reactionCorrect
C. no effect on the reaction
D. slow down the reverse reaction

Explanation

Since the forward reaction is exothermic (delta H negative), raising temperature (Le Chatelier's principle) favours the endothermic reverse reaction.

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