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Chemistry JAMB Past Questions

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1431

If an excess of a liquid hydrocarbon is poured into a jar of chlorine, and the sealed jar is then exposed for several hours to bring sunlight, all the chlorine gas is consumed. The hydrocarbon is said to have undergone

  • A. a polymerization reaction
  • B. an isomerization reaction
  • C. an addition reaction
  • D. a substitution reaction
  • E. a reduction reaction
View Answer & Discuss (2) JAMB 1984
1432
The function of conc. H2SO4 in the esterification of ethanoic acid with ethanol is to
  • A. serve as a dehydrating agent
  • B. serve as a solvent
  • C. act as a catalyst
  • D. prevent any side reaction
  • E. serve as an oxidizing agent
View Answer & Discuss (13) JAMB 1984
1433
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless gas which turns clear limewater milky. The sea shell contains
  • A. sodium chloride
  • B. ammonium nitrate
  • C. calcium carbonate
  • D. calcium chloride
  • E. magnesium chloride
View Answer & Discuss (6) JAMB 1984
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1434
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
  • A. Steel electrodes
  • B. Carbon electrodes
  • C. Mercury electrodes
  • D. Carbon anode and steel cathode
  • E. Carbon cathode and stell anode
View Answer & Discuss (1) JAMB 1984
1435
An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is
  • A. Zn ++
  • B. Ca++
  • C. Ai+++
  • D. Pb++
  • E. Cu++
View Answer & Discuss (4) JAMB 1984
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