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JAMB Chemistry 1984 Question 18

Question 18

Chemical Equilibrium

For the reactions: (I) Melon oil + NaOH ⇌ Soap + Glycerol (II) 3Fe + 4H2O ⇌ Fe3O4 + 4H2 (III) N2O4 ⇌ 2NO2, which of the following satements is true?

  1. A.Each of the three reactions requires a catalyst
  2. B.All the reactions demonstrate Le Chatelier's principle.
  3. C.The presence of a catalyst will increase the yield of the products
  4. D.Increase in pressure will result in higher yields of the products in I and II only
  5. E.Increase in pressure will result in higher yields of the products in III only.
Show the answer and explanation

Answer: B (All the reactions demonstrate Le Chatelier's principle.)

Explanation

All three are reversible reactions at equilibrium, so each responds to changes as Le Chatelier's principle predicts. A catalyst never changes the yield, and higher pressure would lower the yield in III, which makes more gas molecules.