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NECO SSCE Chemistry 2024 past questions and answers

This 2024 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 2024 set with instant marking.

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Sample NECO SSCE Chemistry 2024 questions

1. Which observation is expected when ethene is bubbled through bromine water at room temperature?
  1. The bromine water turns blue-black.
  2. The bromine water is decolourised.
  3. A white precipitate forms immediately.
  4. The gas relights a glowing splint.

Answer: B. The bromine water is decolourised.

Ethene adds bromine across its carbon-carbon double bond, removing the colour of bromine water.

2. What is the main organic product when ethanol is heated with ethanoic acid in the presence of concentrated sulfuric acid?
  1. Ethanal
  2. Ethene
  3. Ethyl ethanoate
  4. Methanoic acid

Answer: C. Ethyl ethanoate

Ethanol and ethanoic acid undergo esterification to form ethyl ethanoate and water.

3. Which monomer forms polyethene by addition polymerisation?
  1. Ethane
  2. Ethanol
  3. Ethanoic acid
  4. Ethene

Answer: D. Ethene

The carbon-carbon double bond in ethene opens so many ethene molecules can join into polyethene.

4. Which general formula represents the alkanes with open-chain molecules?
  1. CnH2n+2
  2. CnH2n
  3. CnH2n-2
  4. CnHn

Answer: A. CnH2n+2

An open-chain alkane with n carbon atoms has the general formula CnH2n+2.

5. In a fractionating column, where are fractions with the lowest boiling points generally collected?
  1. At the hottest bottom of the column
  2. Near the cooler top of the column
  3. Only inside the furnace
  4. At the same point as the residue

Answer: B. Near the cooler top of the column

Low-boiling fractions rise higher before condensing in the cooler upper part of the column.

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