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WAEC WASSCE Chemistry 2026 past questions and answers

This 2026 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 2026 set with instant marking.

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Sample WAEC WASSCE Chemistry 2026 questions

1. Which observation is expected when ethene is shaken with bromine water?
  1. The reddish-brown colour disappears.
  2. A blue-black solid forms.
  3. A white precipitate forms.
  4. A colourless gas is evolved.

Answer: A. The reddish-brown colour disappears.

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

2. What volume of oxygen is required for the complete combustion of 25 cm3 of methane, measured at the same temperature and pressure?
  1. 25 cm3
  2. 50 cm3
  3. 75 cm3
  4. 100 cm3

Answer: B. 50 cm3

From CH4 + 2O2 -> CO2 + 2H2O, two volumes of oxygen react with one volume of methane.

3. During the electrolysis of molten lead(II) bromide, what is formed at the cathode?
  1. Bromine
  2. Oxygen
  3. Lead
  4. Hydrogen

Answer: C. Lead

Lead(II) ions gain electrons at the cathode to form lead atoms.

4. A steel pipeline is connected to a block of magnesium to reduce rusting; which principle provides this protection?
  1. Alloying
  2. Electroplating
  3. Thermal decomposition
  4. Sacrificial protection

Answer: D. Sacrificial protection

Magnesium oxidizes more readily than iron and acts as a sacrificial metal.

5. Which gas released when sulfur-containing fuels burn contributes significantly to acid rain?
  1. Sulfur dioxide
  2. Nitrogen
  3. Argon
  4. Hydrogen

Answer: A. Sulfur dioxide

Sulfur dioxide dissolves and is oxidised in atmospheric moisture to form acidic compounds.

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