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Thursday, 11 June 2026
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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 251:
WAEC 1993
Starch undergoes complete hydrolysis to produce
SchoolNGR Classroom
  • A Maltose
  • B Lactose
  • C Fructose
  • D Glucose
  • E Sucrose
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Question 252:
WAEC 1993
Which of the following solids has a network structure?
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  • A Diamond
  • B Lodine
  • C Sulphur
  • D Graphite
  • E Lron
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Question 253:
WAEC 1993
Trioxosulphate (lV) acid is not stored for a long period because it
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  • A Is a weak dibasic acid
  • B Has bleaching properties
  • C Is unstable and eaily decomposed
  • D Smells strongly of sulphur (lV) oxide
  • E Can act as a germicide
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Question 254:
WAEC 1993
Alkanes are used mainly
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  • A In the production of plastics
  • B As domestic and industrial fuels
  • C In the textile industry
  • D In the hydrogenation of oils
  • E As fine chemicals
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Question 255:
WAEC 1993
Which of the following pairs illustrates isotopy?
SchoolNGR Classroom
  • A But-l-ene and but -2-ene
  • B Ortho-hydrogen and parahydrogen
  • C Oxygen and ozone
  • D Hydrogen and deuterium
  • E Alpha-particle and beta-particle
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