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JAMB UTME Chemistry 2013 past questions and answers

This 2013 JAMB UTME 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 2013 set with instant marking.

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Sample JAMB UTME Chemistry 2013 questions

1. Which conditions are commonly used for the industrial synthesis of ammonia by the Haber process?
  1. High pressure, moderate temperature and an iron catalyst
  2. Low pressure, low temperature and a nickel catalyst
  3. High pressure, very low temperature and no catalyst
  4. Atmospheric pressure, high temperature and platinum catalyst

Answer: A. High pressure, moderate temperature and an iron catalyst

The Haber process uses high pressure, a moderate temperature and finely divided iron catalyst to obtain a practical yield and rate.

2. The bleaching action of moist sulfur dioxide on a coloured material is usually temporary because the gas acts as a
  1. dehydrating agent
  2. reducing agent
  3. strong alkali
  4. precipitating agent

Answer: B. reducing agent

Sulfur dioxide bleaches by reduction, and the original colour can return when the material is exposed to air.

3. When chlorine water is left in sunlight, which gas is released as the solution decomposes?
  1. Hydrogen
  2. Chlorine
  3. Oxygen
  4. Nitrogen

Answer: C. Oxygen

Sunlight decomposes hypochlorous acid in chlorine water and oxygen is evolved.

4. In the extraction of aluminium, cryolite is added to alumina mainly to
  1. oxidize the aluminium ions
  2. prevent the anode from conducting
  3. remove iron impurities by precipitation
  4. lower the melting point of the electrolyte and improve its conductivity

Answer: D. lower the melting point of the electrolyte and improve its conductivity

Cryolite dissolves alumina, lowers the operating temperature and makes the electrolyte more conductive.

5. Brass is an alloy made principally from
  1. copper and zinc
  2. iron and carbon
  3. copper and tin
  4. lead and tin

Answer: A. copper and zinc

Brass consists mainly of copper and zinc.

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