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WAEC WASSCE Chemistry 2024 past questions and answers

This 2024 WAEC WASSCE 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 WAEC WASSCE Chemistry 2024 questions

1. Which substance is the monomer used to produce poly(ethene)?
  1. Ethyne
  2. Ethanol
  3. Ethane
  4. Ethene

Answer: D. Ethene

Poly(ethene) is formed by addition polymerization of ethene molecules.

2. What is the main product when propene reacts with hydrogen in the presence of a nickel catalyst?
  1. Propane
  2. Propanol
  3. Propyne
  4. Propanoic acid

Answer: A. Propane

Hydrogen adds across the carbon-carbon double bond in propene to form propane.

3. Which functional group is present in ethanol, C2H5OH?
  1. -COOH
  2. -CHO
  3. -OH
  4. -COO-

Answer: C. -OH

Ethanol is an alcohol and contains the hydroxyl functional group, -OH.

4. Which pair of products is formed when ethanoic acid reacts with ethanol under suitable conditions?
  1. Ethanal and hydrogen
  2. Ethyl ethanoate and water
  3. Ethene and water
  4. Ethanoate ions and oxygen

Answer: B. Ethyl ethanoate and water

Esterification of ethanoic acid with ethanol produces ethyl ethanoate and water.

5. What is the molecular formula of prop-1-yne?
  1. C3H8
  2. C3H6
  3. C3H5
  4. C3H4

Answer: D. C3H4

An alkyne has the general formula CnH2n-2, so for n = 3 the formula is C3H4.

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