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JAMB Chemistry 1988 Question 28

Question 28

Rates of Reaction

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + SO2(g) + S(s)?

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

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

Explanation

Both a higher temperature and a higher concentration speed up the reaction, so raising both gives the greatest increase in rate.