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Chemistry 2023 WAEC Past Questions

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1

The vapour density of an organic compound with the molecular formula \(C_2H_4O_2\), is
[H=1.0, C=12.0, O= 16.0]

  • A. 40
  • B. 120
  • C. 65
  • D. 30
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2

The following statements are correct except

  • A. energy is released when liquids change to solids.
  • B. carbon atoms in gaseous methane are further apart than those in solid diamond.
  • C. there is large decrease in the volume of a solid metal when pressure is applied to it.
  • D. particles move faster in the gaseous state than in the liquid state.
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3

Which of the following reactions represents the hydrolysis of an alkanoate?

  • A. \(CH_3COOH + OH^- ⇌H^+⇌ CH_3COO^- + H_2O\)
  • B. \(CH_3COOH + C_2H_5OH ⇌H^+⇌ CH_3COOC_2H_5 + H_2O\)
  • C. \(CH_3COOC_2H_5 + H_2O ⇌H^+⇌ CH_3COO^- + CH_3CH_2OH\)
  • D. \(CH_3COOCH_2CH_3 + H_2O ⇌H^+⇌ CH_3COOH + CH_3CH_2OH\)
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4

The following steps are scientific methods except

  • A. experimentation
  • B. problem identification
  • C. Analysis
  • D. Open-mindedness
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5

Alkenes can be manufactured by

  • A. the combustion of alkanes.
  • B. the cracking of hydrocarbons.
  • C. polymerization reactions.
  • D. addition of hydrogen to unsaturated vegetable oils.
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts