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NECO SSCE Chemistry 2012 past questions and answers

This 2012 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 2012 set with instant marking.

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Sample NECO SSCE Chemistry 2012 questions

1. Which gas is a significant contributor to the greenhouse effect?
  1. Methane
  2. Argon
  3. Oxygen
  4. Nitrogen

Answer: A. Methane

Methane absorbs outgoing infrared radiation and is a greenhouse gas.

2. Successive members of a homologous series differ from one another by which group of atoms?
  1. CH3
  2. CH2
  3. OH
  4. COOH

Answer: B. CH2

Adjacent members of a homologous series differ by one CH2 unit.

3. What is produced at the cathode during electrolysis of molten sodium chloride?
  1. Chlorine gas
  2. Hydrogen gas
  3. Sodium
  4. Sodium hydroxide

Answer: C. Sodium

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

4. Which method protects an iron roof from rusting by coating it with zinc?
  1. Annealing
  2. Distillation
  3. Alloying with copper
  4. Galvanizing

Answer: D. Galvanizing

Galvanizing is the process of coating iron or steel with zinc.

5. Which class of hydrocarbon rapidly decolorizes bromine water under ordinary test conditions?
  1. Alkenes
  2. Alkanes
  3. Cycloalkanes
  4. Aromatic hydrocarbons

Answer: A. Alkenes

The carbon-carbon double bond in an alkene undergoes addition with bromine.

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