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Chemistry 2010 WAEC Past Questions

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26

Which of the following statements about the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu is correct?

  • A. copper is the anode
  • B. Manesium is reduced
  • C. Magnesium is the anode
  • D. The double line represents the electrodes
View Answer & Discuss (15) WAEC 2010
27

Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?

  • A. Copper is deposited at the cathode
  • B. Oxygen is liberated at the anode
  • C. it is used for the purification of copper
  • D. The solution becomes acidic
View Answer & Discuss (6) WAEC 2010
28
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
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29
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
30
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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