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Chemistry 1979 JAMB Past Questions

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6
When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued, the precipitate disappears. The reason for this is
  • A. calcium carbonate is formed which on reaction dissolves
  • B. calcium hydrogen carbonate is precipitated and then dissolves
  • C. calcium carbonate is formed which on reaction with further carbondioxide forms solube calcium hydrogen carbonate
  • D. concentration of the solution has occurred with the deposition of calcium hydroxide
  • E. the solution has become saturated and solid carbondioxide has been deposited
View Answer & Discuss (4) JAMB 1979
7

Methanoic acid mixes with water in all proportions and has about the same boiling point as water which of the following methods would you adopt to obtain pure water from a mixture of stand, water and methanoic acid?

  • A. fractional distillation
  • B. filtration followed by distillation
  • C. neutralization with sodium hydroxide followed by distillation
  • D. esterification with ethanol followed by distillation
  • E. neutralization with sodium hydroxide followed by filtration
View Answer & Discuss (48) JAMB 1979
8

Which of the following statements applies during the electrolysis of sodium hydroxide solution using platinum electrodes?

  • A. Na+ ions are discharged at the cathode
  • B. Hydrogen ions are discharged at the cathode
  • C. the concentration of sodium hydroxide decrease at both electrode compartments
  • D. the concentration of sodium hydroxide increases at the cathode only
  • E. the concentration of sodium hydroxide increases at the anode only
View Answer & Discuss (23) JAMB 1979
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9
Which of the following statements is true? When the potassium atom forms its ion
  • A. it gains one electron and becomes neutral
  • B. its atomic number decreases
  • C. it achieves electronic configuration of orgon
  • D. it loses one proton
  • E. it loses one neutron
View Answer & Discuss (10) JAMB 1979
10
Which of the following contains two amphoteric oxides?
  • A. sodium oxide, Zinc oxide , Magnesium oxide
  • B. Aluminium oxide, Calcium oxide, Zinc oxide
  • C. Potassium oxide, Lithium oxide, Carbon monoxide
  • D. Silver oxide, Lead oxide, Sodium oxide
  • E. Sulphur dioxide, Aluminium oxide, Carbon monoxide
View Answer & Discuss (11) JAMB 1979
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