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NECO SSCE Chemistry 2025 past questions and answers

This 2025 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 2025 set with instant marking.

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Sample NECO SSCE Chemistry 2025 questions

1. Which formula represents an alkane containing five carbon atoms?
  1. C5H10
  2. C5H8
  3. C5H12
  4. C5H6

Answer: C. C5H12

Acyclic alkanes have the general formula CnH2n+2, so five carbon atoms give C5H12.

2. Which of the following compounds is an alcohol?
  1. CH3CH2OH
  2. CH3CHO
  3. CH3COOH
  4. CH3OCH3

Answer: A. CH3CH2OH

CH3CH2OH contains the hydroxyl functional group characteristic of alcohols.

3. What is the main purpose of cracking long-chain hydrocarbons in petroleum processing?
  1. To convert alkenes into alcohols
  2. To remove water from crude oil
  3. To separate crude oil into fractions by boiling point
  4. To produce shorter hydrocarbons, including useful alkenes and fuels

Answer: D. To produce shorter hydrocarbons, including useful alkenes and fuels

Cracking breaks large hydrocarbon molecules into smaller, more useful molecules such as petrol-range alkanes and alkenes.

4. Which monomer forms poly(propene) by addition polymerisation?
  1. CH3CH3
  2. CH2=CHCH3
  3. CH3CH2OH
  4. CH3COOH

Answer: B. CH2=CHCH3

Propene molecules add across their carbon-carbon double bonds to form poly(propene).

5. Which petroleum fraction is collected as the non-volatile residue near the bottom of a fractionating column?
  1. Bitumen
  2. Refinery gas
  3. Petrol
  4. Kerosene

Answer: A. Bitumen

Bitumen has very large molecules and a high boiling range, so it remains as residue near the bottom of the column.

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