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Chemistry 1991 WAEC Past Questions

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26
Which of the following properties is not characteristic of electrovalent compounds?
  • A. formation of crystalline solids
  • B. solubility in polar solvents
  • C. high vapour pressures
  • D. high melting and boiling points
  • E. ability to conduct electricity in aqueous solution
View Answer & Discuss (4) WAEC 1991
27
Compounds that have the same molecular formula but different structures are said to be
  • A. allotropic
  • B. polymorphic
  • C. polymeric
  • D. isomeric
  • E. isotopic
View Answer & Discuss (2) WAEC 1991
28
In which of the following crystals are the particles held by van der Waal's forces only?
  • A. Sodium chloride
  • B. Ice
  • C. Diamond
  • D. Iodine
  • E. Quartz
View Answer & Discuss (2) WAEC 1991
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29
A current of 4.0 amperes was passed through copper (ll) tetraoxosulphate (IV) solution for one hour using copper electrodes. What was the mass of copper deposited? (Cu = 64, 1F = 96500 C)
  • A. 3.2g
  • B. 4.8g
  • C. 6.4g
  • D. 48g
  • E. 96g
View Answer & Discuss (4) WAEC 1991
30
When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was
  • A. concentrated
  • B. supersaturated
  • C. unsaturated
  • D. colloidal
  • E. saturated
View Answer & Discuss (7) WAEC 1991
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