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JAMB UTME Chemistry 2011 past questions and answers

This 2011 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 2011 set with instant marking.

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Sample JAMB UTME Chemistry 2011 questions

1. Which molecular formula is consistent with an open-chain alkene containing four carbon atoms?
  1. C4H8
  2. C4H10
  3. C4H6
  4. C4H12

Answer: A. C4H8

Open-chain alkenes with one double bond have the general formula CnH2n, so four carbon atoms give C4H8.

2. Ethanol reacts with ethanoic acid in the presence of concentrated sulfuric acid to form which main organic product?
  1. Ethanal
  2. Ethyl ethanoate
  3. Ethene
  4. Ethanoic anhydride

Answer: B. Ethyl ethanoate

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

3. What is the repeating unit in poly(ethene) formed from ethene molecules?
  1. -CH2-
  2. -CH=CH-
  3. -CH2-CH2-
  4. -CH3-CH3-

Answer: C. -CH2-CH2-

The double bond in each ethene molecule opens during addition polymerization to give the repeating unit -CH2-CH2-.

4. When methane reacts with chlorine in ultraviolet light, which type of reaction is initiated?
  1. Addition
  2. Esterification
  3. Hydration
  4. Substitution

Answer: D. Substitution

Ultraviolet light initiates a free-radical substitution in which a hydrogen atom in methane is replaced by chlorine.

5. What is the principal product when ethanol is oxidized completely by excess acidified potassium dichromate under reflux?
  1. Ethanoic acid
  2. Ethene
  3. Ethyl ethanoate
  4. Methanoic acid

Answer: A. Ethanoic acid

Under reflux with an excess oxidizing agent, ethanol is oxidized fully to ethanoic acid.

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