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Chemistry WAEC Past Questions

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601
Consider the cell represented below: Zn/Zn2+(aq) // Cu2+(aq) / Cu(s). Which of the following statements is correct about the cell
  • A. Zn is oxidized to Zn2+
  • B. Cu is oxidized to Cu2+
  • C. It is an electrolytic cell
  • D. each single line represents a salt bridge
View Answer & Discuss WAEC 2004
602
When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of
  • A. calcium only
  • B. zinc only
  • C. calcium and znic only
  • D. sodium and zinc only
View Answer & Discuss (4) WAEC 2004
603
The condensation of several amino acid molecules gives
  • A. long chain alkanoic acids
  • B. secondary alkanols
  • C. alkanoates
  • D. proteins
View Answer & Discuss (1) WAEC 2004
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604

Which of the following statements is true of an endothermic reaction? I. Heat is absorbed from the surrounding II. The heat content of the products is more than that of the reactants III. The enthalpy change is positive IV. The surrounding is at a lower temperature than the system.

  • A. l only
  • B. l and ll only
  • C. l,ll and lll only
  • D. l, ll, lll and lV
View Answer & Discuss (13) WAEC 2004
605
What is the change in the oxidation number of 1- in the reaction represented by the following equation? 51 -1(aq) + 6H+(aq) + 1O-3(aq) → 312(g) + 3H2O(l)
  • A. -5 to -3
  • B. -1 to 0
  • C. + 5 to + 0
  • D. -1 to + 2
View Answer & Discuss WAEC 2004
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