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WAEC WASSCE Chemistry 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample WAEC WASSCE Chemistry 2009 questions

1. Why can a zinc coating protect an iron object even if a small area of the coating is scratched?
  1. Zinc is more reactive than iron and corrodes preferentially
  2. Zinc prevents oxygen from existing in air
  3. Iron becomes a noble gas under the coating
  4. The scratch instantly seals itself with iron oxide

Answer: A. Zinc is more reactive than iron and corrodes preferentially

Zinc acts as a sacrificial metal because it is oxidized more readily than iron.

2. In the blast furnace, which substance removes silica impurities from the iron ore?
  1. Coke
  2. Calcium oxide
  3. Carbon monoxide
  4. Nitrogen

Answer: B. Calcium oxide

Calcium oxide reacts with silica to form calcium silicate slag.

3. Which oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide?
  1. Carbon dioxide
  2. Magnesium oxide
  3. Aluminium oxide
  4. Sulfur dioxide

Answer: C. Aluminium oxide

Aluminium oxide is amphoteric and reacts with both acids and bases.

4. During electrolysis of concentrated aqueous sodium chloride using inert electrodes, which gas is produced at the anode?
  1. Hydrogen
  2. Oxygen
  3. Nitrogen
  4. Chlorine

Answer: D. Chlorine

Chloride ions are preferentially oxidized to chlorine at the anode in concentrated brine.

5. How many moles of electrons are required to deposit 1 mol of zinc from Zn2+(aq)?
  1. 2 mol
  2. 1 mol
  3. 0.5 mol
  4. 4 mol

Answer: A. 2 mol

The reduction Zn2+ + 2e- → Zn requires two moles of electrons per mole of zinc.

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