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WAEC WASSCE Chemistry 2007 past questions and answers

This 2007 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 2007 set with instant marking.

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Sample WAEC WASSCE Chemistry 2007 questions

1. During electrolysis of aqueous copper(II) sulfate using inert electrodes, which product is formed at the cathode?
  1. Copper metal
  2. Hydrogen gas
  3. Oxygen gas
  4. Sulfur dioxide

Answer: A. Copper metal

Copper(II) ions are preferentially discharged at the cathode and gain electrons to form copper metal.

2. For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing pressure at constant temperature?
  1. The equilibrium shifts to the left
  2. The equilibrium shifts to the right
  3. The equilibrium position is unchanged
  4. Ammonia decomposes completely

Answer: B. The equilibrium shifts to the right

Higher pressure favours the side with fewer gas molecules, which is the ammonia side.

3. A powdered solid reacts faster than the same mass of large lumps mainly because the powder has a larger
  1. density
  2. particle mass
  3. surface area exposed
  4. melting point

Answer: C. surface area exposed

Powdering increases the exposed surface area available for effective collisions.

4. Which compound is produced when ethanol is oxidized completely under suitable conditions?
  1. Ethene
  2. Ethane
  3. Ethanal
  4. Ethanoic acid

Answer: D. Ethanoic acid

Complete oxidation of ethanol gives ethanoic acid.

5. In the extraction of iron in a blast furnace, carbon monoxide mainly acts as a
  1. reducing agent
  2. catalyst
  3. dehydrating agent
  4. neutralizing agent

Answer: A. reducing agent

Carbon monoxide removes oxygen from iron(III) oxide, reducing it to iron.

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