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WAEC WASSCE Chemistry 2014 past questions and answers

This 2014 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 2014 set with instant marking.

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Sample WAEC WASSCE Chemistry 2014 questions

1. Which observation occurs when ethene is bubbled through aqueous bromine?
  1. A blue precipitate forms
  2. The solution turns milky
  3. The orange-brown colour disappears
  4. A silver mirror forms

Answer: C. The orange-brown colour disappears

Ethene adds bromine across its carbon-carbon double bond, decolourising the bromine solution.

2. What is the repeating unit in poly(ethene)?
  1. -CH2-CH2-
  2. -CH=CH-
  3. -CH3-CH3-
  4. -COO-CH2-

Answer: A. -CH2-CH2-

Addition polymerization opens ethene's double bond to form repeating -CH2-CH2- units.

3. Which product is formed when ethanol is completely oxidized using excess acidified potassium dichromate(VI)?
  1. Ethene
  2. Ethanoic acid
  3. Ethyl ethanoate
  4. Ethane

Answer: B. Ethanoic acid

Under complete oxidation conditions, ethanol is oxidized through ethanal to ethanoic acid.

4. Which pair of products forms when ethanol reacts with ethanoic acid in the presence of concentrated sulfuric acid?
  1. Ethanal and hydrogen
  2. Ethene and water
  3. Ethanol and carbon dioxide
  4. Ethyl ethanoate and water

Answer: D. Ethyl ethanoate and water

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

5. What is the minimum number of moles of oxygen needed to burn 1 mole of propane completely?
  1. 2
  2. 3
  3. 5
  4. 4

Answer: C. 5

The balanced equation C3H8 + 5O2 -> 3CO2 + 4H2O requires 5 moles of oxygen per mole of propane.

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