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Chemistry 1992 WAEC Past Questions

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11
The scum formed when soap is mixed with hard water could be
  • A. calcium trioxocarbonate (IV)
  • B. propane- 1, 2, 3 - triol
  • C. calcium hydrogentrioxocarbonate (IV)
  • D. magnesium tetraoxosulphate (IV)
  • E. calcium stearate
View Answer & Discuss (4) WAEC 1992
12
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)
  • A. 0. 11F
  • B. 0.12F
  • C. 0.22F
  • D. 1.1F
  • E. 2.2F
View Answer & Discuss (1) WAEC 1992
13
''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the
  • A. Kinetic theory
  • B. rate law
  • C. atomic theory
  • D. collision theory
  • E. gas laws
View Answer & Discuss WAEC 1992
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14
What is the following compounds will not decompose when heated strongly ?
  • A. NaHCO3
  • B. K2CO3
  • C. MgCO3
  • D. Ca(HCO3)2
  • E. ZnCO3
View Answer & Discuss WAEC 1992
15
What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P (s) + 5O(2)(g) → 2P2O5(g)
  • A. 0 to + 2
  • B. 0 to 5
  • C. +4 to + 2
  • D. +4 to +5
  • E. +4 to +7
View Answer & Discuss WAEC 1992
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