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NECO SSCE Chemistry 2007 past questions and answers

This 2007 NECO SSCE 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 2007 set with instant marking.

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Sample NECO SSCE Chemistry 2007 questions

1. What volume of 0.10 mol dm^-3 H2SO4 completely neutralizes 25.0 cm^3 of 0.20 mol dm^-3 NaOH?
  1. 25.0 cm^3
  2. 12.5 cm^3
  3. 50.0 cm^3
  4. 10.0 cm^3

Answer: A. 25.0 cm^3

The 5.00 mmol of OH- requires 2.50 mmol of H2SO4, which occupies 25.0 cm^3 at 0.10 mol dm^-3.

2. Which indicator is most suitable for titrating aqueous ammonia with hydrochloric acid?
  1. Phenolphthalein
  2. Methyl orange
  3. Litmus only
  4. Universal indicator paper only

Answer: B. Methyl orange

The equivalence solution is acidic because ammonium ions hydrolyse, so methyl orange changes colour in the suitable range.

3. Which products form when sodium hydrogencarbonate reacts completely with hydrochloric acid?
  1. Sodium hydroxide, chlorine and water
  2. Sodium carbonate and hydrogen
  3. Sodium chloride, carbon dioxide and water
  4. Sodium chloride and oxygen

Answer: C. Sodium chloride, carbon dioxide and water

An acid reacts with a hydrogencarbonate to form a salt, carbon dioxide and water.

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

Answer: D. Zinc oxide

Zinc oxide is amphoteric and reacts with both acids and strong alkalis.

5. In the reaction Fe2O3 + 3CO -> 2Fe + 3CO2, which substance is reduced?
  1. Fe2O3
  2. CO
  3. CO2
  4. Fe

Answer: A. Fe2O3

Iron(III) oxide gains electrons as iron changes from oxidation state +3 to 0.

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