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Chemistry WAEC Past Questions

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461

Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million's reagent, it can be concluded that

  • A. K is a carbohydrate and L is a protein
  • B. K is alkaline and L is acidic
  • C. K is unsaturated and L is a reducing sugar
  • D. K is a reducing agent and L is an amino acid
View Answer & Discuss WAEC 2000
462

A colourless, odourless liquid T, gives effervescence with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate (V) solution T is most probably

  • A. sodium chloride solution
  • B. barium chloride solution
  • C. dilute trioxonitrate (V) acid
  • D. dilute hydrochloric acid
View Answer & Discuss (13) WAEC 2000
463

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolves in excess sodium hydroxide because

  • A. sodium is more reactive than zinc
  • B. sodium hydroxide is a strong alkali
  • C. zinc hydroxide is amphoteric
  • D. zinc hydroxide is unstable
View Answer & Discuss WAEC 2000
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464

Which of the following on burning in air contributes to acid rain?

  • A. Sulphur
  • B. Magnesium
  • C. Aluminium
  • D. Zinc
View Answer & Discuss (1) WAEC 2000
465

If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to

  • A. 20 mol dm-3
  • B. 0.40 mol dm-3
  • C. 2.00 mol dm-3
  • D. 5.00 mol dm -3
View Answer & Discuss (11) WAEC 2000
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts