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JAMB Chemistry 1985 Question 18

Question 18

Rates of Reaction

X + Y ⇌ Z is an equilibrium reaction. The addition of a catalyst.

  1. A.increases the amount of Z produced in a given time.
  2. B.increases the rate of change in concentrations of X, Y and Z
  3. C.increases the rate of disappearance of X and Y
  4. D.increases the rate of the forward reaction
  5. E.decreases the amounts of X and Y left after the attainment of equilibrium.
Show the answer and explanation

Answer: B (increases the rate of change in concentrations of X, Y and Z)

Explanation

A catalyst speeds up both the forward and backward reactions equally, so all the concentrations change faster and equilibrium is reached sooner. It does not change the amounts present at equilibrium.