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JAMB Chemistry 2007 Question 15

Question 15

Chemical Equilibrium

H3PO4(aq) + H2O(l) ⇌ H2PO4−(aq) + H3O+(aq) ΔH = −13kJ at 298K
In the reaction above, an increase in temperature would

  1. A.slow down the reverse reaction
  2. B.have no effect on the reaction
  3. C.favour the reverse reaction
  4. D.favour the forward reaction.
Show the answer and explanation

Answer: C (favour the reverse reaction)

Explanation

The forward reaction is exothermic (ΔH negative), so heating favours the endothermic reverse reaction.