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NECO SSCE Chemistry 2009 past questions and answers

This 2009 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 2009 set with instant marking.

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Sample NECO SSCE Chemistry 2009 questions

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

Answer: B. Hydrogen

Water is reduced at the cathode in concentrated brine, producing hydrogen gas.

2. Iron roofing sheets are protected from rusting by coating them with zinc; what is this process called?
  1. Annealing
  2. Electroplating with copper
  3. Alloying
  4. Galvanizing

Answer: D. Galvanizing

Galvanizing protects iron with a zinc coating that also corrodes preferentially if the coating is damaged.

3. In a blast furnace, which substance is the main reducing agent that converts iron(III) oxide to iron?
  1. Carbon monoxide
  2. Calcium carbonate
  3. Silicon dioxide
  4. Oxygen

Answer: A. Carbon monoxide

Carbon monoxide removes oxygen from iron(III) oxide to form iron and carbon dioxide.

4. Which pair of metals are the principal constituents of bronze?
  1. Iron and carbon
  2. Copper and zinc
  3. Copper and tin
  4. Lead and tin

Answer: C. Copper and tin

Bronze is an alloy made mainly from copper and tin.

5. What is the main purpose of adding cryolite during the electrolytic extraction of aluminium?
  1. To oxidize aluminium ions
  2. To dissolve alumina and lower the operating temperature
  3. To provide the carbon anodes
  4. To remove iron from the ore by magnetic separation

Answer: B. To dissolve alumina and lower the operating temperature

Cryolite dissolves alumina and lowers the melting temperature of the electrolyte.

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