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Chemistry 1986 JAMB Past Questions

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21
The iron (III) oxide impurity in bauxite can be removed by?
  • A. Fractional crystallization in acid solution
  • B. dissolution in sodium hydroxide and filtration
  • C. extraction with concentrated ammonia and reprecipitation
  • D. electroysis of molten mixture
View Answer & Discuss (15) JAMB 1986
22

Which of the following does NOT contain aluminium as component?

  • A. Over-head cables
  • B. Duralumin
  • C. Container for caustic soda
  • D. Container for nitric acid
View Answer & Discuss (24) JAMB 1986
23

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

  • A. lead (II) oxide
  • B. calcium oxide
  • C. zinc oxide
  • D. lead nitrate
View Answer & Discuss (10) JAMB 1986
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24
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?
  • A. KCI
  • B. NaNO3
  • C. K2SO4
  • D. CaSO4
View Answer & Discuss (5) JAMB 1986
25
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
  • A. Electrolysis of solution of its salts
  • B. Decomposition of its oxides
  • C. Displacement from solution by an alkali metal
  • D. Electroiysis of fused salt
View Answer & Discuss (6) JAMB 1986
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