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JAMB Chemistry 1998 Question 31

Question 31

Chemical Equilibrium

2Cl2(g) + 2H2O(g) ⇌ 4HCl(g) + O2(g) ΔH° = +115kJ mol−1. In the above equilibrium reaction, a decrease in temperature will

  1. A.favour the reverse reaction
  2. B.favour the forward reaction
  3. C.have no effect on the equilibrium state
  4. D.double the rate of the reverse reaction.
Show the answer and explanation

Answer: A (favour the reverse reaction)

Explanation

The forward reaction is endothermic. Cooling favours the exothermic direction, which here is the reverse reaction.