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Chemistry 1998 WAEC Past Questions

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6
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
  • A. Glucose solution
  • B. Aqueous copper (ll) tetraoxosulphate (IV)
  • C. Dilute sodium chloride solution
  • D. Concentrated hydrochloric acid
  • E. Dilute copper (ll) chloride solution
View Answer & Discuss (3) WAEC 1998
7
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
  • A. 0.318g
  • B. 0.635g
  • C. 18g
  • D. 6.35g
  • E. 9.65g
View Answer & Discuss WAEC 1998
8

How many electrons are removed from Cr2- when it is oxidized to CrO42-?

  • A. o
  • B. 2
  • C. 4
  • D. 8
  • E. 10
View Answer & Discuss (6) WAEC 1998
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9
Substances which absorb water from the atmosphere without dissolving in it are sid to be
  • A. anhydrous
  • B. hygroscopic
  • C. insolube
  • D. hydrated
  • E. efflorescent
View Answer & Discuss (1) WAEC 1998
10
Pipe-borne water is usually chlorinated in order to
  • A. improve the teste of the water
  • B. remove the hardness in the water clear
  • C. coagulate sediments in the water
  • D. kill harmful bacteria in the water
  • E. make the water clear and colourless
View Answer & Discuss WAEC 1998
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