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WAEC WASSCE Chemistry 2022 past questions and answers

This 2022 WAEC WASSCE Chemistry set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2022 set with instant marking.

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Sample WAEC WASSCE Chemistry 2022 questions

1. For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing the pressure at constant temperature?
  1. The equilibrium shifts to the right
  2. The equilibrium shifts to the left
  3. The equilibrium position is unchanged
  4. The equilibrium constant increases

Answer: A. The equilibrium shifts to the right

Increasing pressure favours the side with fewer gas molecules, which is the ammonia side.

2. What product is formed at the cathode when molten sodium chloride is electrolysed?
  1. Chlorine gas
  2. Sodium metal
  3. Hydrogen gas
  4. Sodium hydroxide

Answer: B. Sodium metal

Sodium ions gain electrons at the cathode to form sodium atoms.

3. How does a catalyst increase the rate of a chemical reaction?
  1. It increases the amount of product at equilibrium
  2. It raises the temperature of the reaction mixture
  3. It provides an alternative pathway with lower activation energy
  4. It increases the concentration of the reactants

Answer: C. It provides an alternative pathway with lower activation energy

A catalyst offers a reaction pathway with lower activation energy without being consumed overall.

4. In a simple cell made from zinc and copper electrodes in suitable electrolytes, in which direction do electrons flow through the external wire?
  1. From copper to zinc
  2. From the electrolyte to the zinc electrode
  3. From copper to the electrolyte
  4. From zinc to copper

Answer: D. From zinc to copper

Zinc is oxidised and releases electrons, which travel through the wire to the copper electrode.

5. For N2(g) + 3H2(g) ⇌ 2NH3(g), which expression represents Kc?
  1. [NH3]^2/([N2][H2]^3)
  2. [N2][H2]^3/[NH3]^2
  3. [NH3]/([N2][H2])
  4. [NH3]^2/([N2]^2[H2]^3)

Answer: A. [NH3]^2/([N2][H2]^3)

The equilibrium concentrations of products are raised to their stoichiometric coefficients and divided by the corresponding reactant terms.

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