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JAMB Chemistry 2022 Question 4

Question 4

Rates of Reaction

Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O + SO2(g) + S(s)
In the above reaction, the greatest increase in the rate of the chemical reaction can be effected by

  1. A.a decrease in volume and an increase in pressure of the reactants
  2. B.an increase in temperature and a decrease in the concentration of the reactants
  3. C.an increase in temperature and an increase in the concentration of the reactants
  4. D.A decrease in temperature and an increase in the concentration of the reactants
Show the answer and explanation

Answer: C (an increase in temperature and an increase in the concentration of the reactants)

Explanation

The reactants are in solution, so pressure has no effect. Raising both temperature and concentration increases the number of effective collisions most.