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Chemistry WAEC Past Questions

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841
What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
  • A. +3 to + 2
  • B. + 4 to + 2
  • C. + 5 to + 2
  • D. + 7 to 2
View Answer & Discuss WAEC 2010
842
The quantity of electricity required to discharge 1 mole of univalent ion is
  • A. 9,600 C
  • B. 48,250 C
  • C. 96,500 C
  • D. 193,00 C
View Answer & Discuss (3) WAEC 2010
843
Fact and oils are used as raw materials in the following industries except
  • A. paint industry
  • B. plastic industry
  • C. margarine industry
  • D. cosmetics industry
View Answer & Discuss WAEC 2010
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844

An advantage of detergent over soap is that detergents

  • A. are readily available
  • B. are in powerdered from
  • C. are non-biodegradable
  • D. lather readily with water
View Answer & Discuss (4) WAEC 2010
845
The products of fermentation of sugar are
  • A. carbon(IV) oxide and water
  • B. ethanol and carbon (IV) oxide
  • C. ethanol and water
  • D. ethanol and enzymes
View Answer & Discuss WAEC 2010
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