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Chemistry 1990 WAEC Past Questions

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31
The following metals are extracted by the electrolytic method except
  • A. potassium
  • B. calcium
  • C. sodium
  • D. tin
  • E. magnesium
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32
Petrol can be obtained from diesel by
  • A. distillation
  • B. cracking
  • C. catalysis
  • D. polymerization
  • E. dehydrogenation
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33

(a) Write the electronic configuration of an element with atomic number 15, indicating the distribution of electrons in the energy sub-levels

(b) Give the formula and the colour of the complex formed between ammonia and copper (II) ions

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34

(a) Give two reasons why carbon(IV) oxide is used for extinguishing fire

(b) Explain briefly the water softening action of cation exchane resins.

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35

 A hydrocarbon X which decolorizes bromine water but has no action on ammoniacal silver trioxonitrate (V) solution was found to have a molar mass of 58 g mol\(^{-1}\)

(a) Deduce the molecular formula of X. (H = 1, C = 12)

(b) Write the structures of two isomers of X.

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