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Chemistry 1998 WAEC Past Questions

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11
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 (5) WAEC 1998
12
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
13
Two metallic ions commonly present in hard water are
  • A. Ca2+ and Zn2+
  • B. Cu2+ and Na+
  • C. Mg2+ and Ca2+
  • D. Fe2+ and Na+
  • E. Zn2+ and Cu2+
View Answer & Discuss WAEC 1998
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14
Rusting of iron is an example of
  • A. deliquescence
  • B. decomposition
  • C. displacement reaction
  • D. redox reaction
  • E. reversible reaction
View Answer & Discuss WAEC 1998
15
Aluminium is extracted from
  • A. magnetite
  • B. cryolite
  • C. bauxite
  • D. cassiterite
View Answer & Discuss WAEC 1998
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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