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WAEC WASSCE Chemistry 2011 past questions and answers

This 2011 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 2011 set with instant marking.

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Sample WAEC WASSCE Chemistry 2011 questions

1. When ethanol reacts with ethanoic acid in the presence of concentrated sulfuric acid, which pair of products is formed?
  1. Ethyl ethanoate and water
  2. Ethanol and carbon dioxide
  3. Ethene and hydrogen
  4. Sodium ethanoate and water

Answer: A. Ethyl ethanoate and water

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

2. Which structural feature identifies an alkene?
  1. A carbon-carbon triple bond
  2. A carbon-carbon double bond
  3. A hydroxyl group
  4. A carboxyl group

Answer: B. A carbon-carbon double bond

Alkenes are unsaturated hydrocarbons containing at least one carbon-carbon double bond.

3. What are the coefficients of carbon dioxide and water, respectively, in the balanced complete combustion equation for propane?
  1. 1 and 4
  2. 3 and 2
  3. 3 and 4
  4. 4 and 3

Answer: C. 3 and 4

Balancing C3H8 + 5O2 gives 3CO2 + 4H2O.

4. Which product is formed when many ethene molecules join by addition polymerization?
  1. Polypropene
  2. Polyvinyl chloride
  3. Polystyrene
  4. Polyethene

Answer: D. Polyethene

Addition polymerization of ethene produces polyethene.

5. How many structural isomers does butane, C4H10, have?
  1. 2
  2. 3
  3. 4
  4. 5

Answer: A. 2

Butane has the straight-chain and branched-chain structures, giving two structural isomers.

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