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86
When the two end alkyl groups ethyl ethanoate are interchange, the compound formed is known as
  • A. methyl ethanoate
  • B. ethyl propanaote
  • C. methyl propanoate
  • D. propyl ethanoate
View Answer & Discuss (5) JAMB 1999
87

A mixture of iodine and sulphur crystals can be separated by treatment with?

  • A. Water to filter off sulphur
  • B. carbon (IV) sulphide to filter off iodine
  • C. ethanoic acid to filter off sulphur
  • D. methanol to filter off iodine
View Answer & Discuss (38) JAMB 2000
88
Sieving is a technique used to separate mixture containing solid particles of
  • A. small sizes
  • B. large sizes
  • C. differents sizes
  • D. the same sizes
View Answer & Discuss (23) JAMB 2000
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
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
89

Which of the following compounds is composed of Al, Si, O and H?

  • A. Epsom salt
  • B. Limestone
  • C. Clay
  • D. Urea
View Answer & Discuss (13) JAMB 2000
90
50 cm3 of carbon (II) oxide was exploded with 150 cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
  • A. Carbon (II) oxide
  • B. Carbon (IV) oxide
  • C. Oxygen
  • D. Nitrogen
View Answer & Discuss (34) JAMB 2000
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WAEC offline past questions - with all answers and explanations in one app - Download for free
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts