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Chemistry WAEC Past Questions

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366

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 (7) WAEC 1998
367
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
368
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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369
Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl2(aq) + H2C2O 4(s) ⇌ CaC 2O2
  • A. Calcium chloride solution
  • B. Concentrated hydrochloric acid
  • C. Ethanol
  • D. Ethanedioc acid
  • E. Aqueous ammonia
View Answer & Discuss (7) WAEC 1998
370
The spontaneity of a chemical reaction is determined by the change in the
  • A. concentration of the reactants
  • B. temperature of the system
  • C. free energy of the system
  • D. pressure applied to the system
  • E. volume of the reactants
View Answer & Discuss (1) WAEC 1998
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