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Chemistry WAEC Past Questions

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931

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

  • A. l and ll only
  • B. l, ll, and III only
  • C. lll and IV only
  • D. I and III only
View Answer & Discuss (2) WAEC 2013
932
Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
  • A. S4O62-(aq)
  • B. S4O32-(aq)
  • C. 12(aq)
  • D. 1-(aq)
View Answer & Discuss (8) WAEC 2013
933
The separation of petroleum fractions depends on the differences in their
  • A. melting points
  • B. molar masses
  • C. solubilities
  • D. boiling points
View Answer & Discuss (1) WAEC 2013
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934
The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
  • A. soap
  • B. sodium ethanoate
  • C. sodium methoxide
  • D. water
View Answer & Discuss WAEC 2013
935
Which of the following organic compounds would decolourize bromie water?
  • A. Benzene
  • B. Cyclobutane
  • C. Hexane
  • D. Pentane
View Answer & Discuss WAEC 2013
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