passwella.
Menu

JAMB Chemistry 1990 Question 29

Question 29

Chemical Equilibrium

In the reaction 2HI(g) ⇌ H2(g) + I2(g), ΔH = 10 kJ; the concentration of iodine in the equilibrium mixture can be increased by

  1. A.raising the pressure
  2. B.raising the temperature
  3. C.adding a catalyst
  4. D.lowering the pressure
Show the answer and explanation

Answer: B (raising the temperature)

Explanation

The forward reaction is endothermic (ΔH positive), so heating shifts the equilibrium to the right, making more I2. Pressure has no effect because both sides have 2 moles of gas.