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JAMB UTME Chemistry 2015 past questions and answers

This 2015 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 2015 set with instant marking.

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Sample JAMB UTME Chemistry 2015 questions

1. In the Haber process, which practice helps to improve the overall yield of ammonia?
  1. Recycle unreacted nitrogen and hydrogen
  2. Remove the iron catalyst continuously
  3. Use a very low pressure
  4. Prevent nitrogen from reacting with hydrogen

Answer: A. Recycle unreacted nitrogen and hydrogen

Recycling the unreacted gases gives them further opportunities to form ammonia.

2. A high biochemical oxygen demand (BOD) in a river most directly indicates a large amount of
  1. dissolved mineral salts
  2. biodegradable organic matter
  3. dissolved oxygen
  4. suspended sand

Answer: B. biodegradable organic matter

Microorganisms consume more oxygen while decomposing abundant biodegradable organic matter.

3. Which monomer forms poly(ethene) by addition polymerization?
  1. Ethane
  2. Ethanol
  3. Ethene
  4. Ethanoic acid

Answer: C. Ethene

The carbon-carbon double bonds in ethene open and link into a long polymer chain.

4. Crude oil fractions are separated mainly because their components have different
  1. densities in water
  2. colours
  3. solubilities in water
  4. boiling points

Answer: D. boiling points

Fractional distillation separates hydrocarbons according to their different boiling points.

5. What is the concentration, in mol/dm3, of a solution containing 0.20 mol of solute in 500 cm3 of solution?
  1. 0.40
  2. 0.10
  3. 2.50
  4. 4.00

Answer: A. 0.40

Since 500 cm3 is 0.500 dm3, the concentration is 0.20/0.500 = 0.40 mol/dm3.

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