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JAMB UTME Chemistry 2012 past questions and answers

This 2012 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 2012 set with instant marking.

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Sample JAMB UTME Chemistry 2012 questions

1. Complete combustion of 1 mole of propane, C3H8, produces how many moles of carbon dioxide?
  1. 3
  2. 1
  3. 2
  4. 4

Answer: A. 3

The balanced equation C3H8 + 5O2 -> 3CO2 + 4H2O shows that 1 mole of propane produces 3 moles of carbon dioxide.

2. Which repeat unit forms the addition polymer made from ethene?
  1. [-CH(CH3)-CH2-]n
  2. [-CH2-CH2-]n
  3. [-CH2-O-]n
  4. [-CO-CO-]n

Answer: B. [-CH2-CH2-]n

Opening the C=C bond in ethene joins its CH2 groups into the repeating unit [-CH2-CH2-]n.

3. How does soap help remove oily dirt from fabric during washing?
  1. It converts the oil into a gas
  2. It raises the boiling point of water
  3. Its molecules form micelles that disperse grease in water
  4. It permanently hardens the oil

Answer: C. Its molecules form micelles that disperse grease in water

Soap molecules surround grease with their hydrophobic ends while their hydrophilic ends interact with water, dispersing the dirt.

4. Which pair of products is formed when glucose ferments under suitable anaerobic conditions?
  1. Methanol and oxygen
  2. Ethanoic acid and hydrogen
  3. Ethene and water
  4. Ethanol and carbon dioxide

Answer: D. Ethanol and carbon dioxide

Yeast fermentation converts glucose according to C6H12O6 -> 2C2H5OH + 2CO2.

5. What are the products of reacting ethanol with ethanoic acid in the presence of concentrated sulfuric acid?
  1. Ethyl ethanoate and water
  2. Ethene and carbon dioxide
  3. Methanol and ethanoate ions
  4. Ethanal and hydrogen

Answer: A. Ethyl ethanoate and water

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

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