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WAEC WASSCE Chemistry 2016 past questions and answers

This 2016 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 2016 set with instant marking.

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Sample WAEC WASSCE Chemistry 2016 questions

1. Which fraction or residue from crude oil is commonly used for road surfacing?
  1. Petrol
  2. Bitumen
  3. Kerosene
  4. Refinery gas

Answer: B. Bitumen

Bitumen is the heavy residue used to surface roads and roofs.

2. Which substance is formed when many ethene molecules join by addition polymerization?
  1. Poly(propene)
  2. Polyvinyl chloride
  3. Polystyrene
  4. Poly(ethene)

Answer: D. Poly(ethene)

Addition polymerization of ethene produces poly(ethene) without eliminating a small molecule.

3. Which pair of reactants is used to prepare an ester by esterification?
  1. A carboxylic acid and an alcohol
  2. An alkane and oxygen
  3. An alkene and hydrogen
  4. An aldehyde and ammonia

Answer: A. A carboxylic acid and an alcohol

A carboxylic acid reacts with an alcohol to form an ester and water.

4. When an ester is heated with aqueous sodium hydroxide, which products are generally formed?
  1. An alkene and hydrogen
  2. A carboxylic acid and oxygen
  3. A carboxylate salt and an alcohol
  4. An aldehyde and water

Answer: C. A carboxylate salt and an alcohol

Alkaline hydrolysis of an ester gives the salt of the carboxylic acid and an alcohol.

5. Which gas is produced in large quantities by the complete combustion of carbon-containing fossil fuels and contributes to the greenhouse effect?
  1. Nitrogen
  2. Hydrogen
  3. Carbon dioxide
  4. Chlorine

Answer: C. Carbon dioxide

Complete combustion of carbon in fossil fuels forms carbon dioxide, a greenhouse gas.

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