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Chemistry JAMB Past Questions

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1386
Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because
  • A. it loses its water of crystallization
  • B. atmospheric nitrogen displaces chlorine from it
  • C. carbon (IV) oxide of the atmosphere displaceschlorine from it
  • D. bleaching agents should be stored in solution
View Answer & Discuss (6) JAMB 1989
1387
The products of the thermal decomposition of ammonium trioxonitrate (V) are
  • A. NO 2 and oxygen
  • B. NH3 and oxygen
  • C. nitrogen and water
  • D. N2O and water
View Answer & Discuss (4) JAMB 1989
1388
The scale of a chemical balance is made of iron plate and coated with copper electrolytically because
  • A. iron is less susceptible to corrosion than copper
  • B. copper is twice as less susceptitible to corrosion as iron
  • C. copper is less susceptible to corrosion than iron
  • D. copper and iron are equally susceptible to corrosion
View Answer & Discuss (6) JAMB 1989
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1389
A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is
  • A. copper
  • B. aluminium
  • C. zinc
  • D. sodium
View Answer & Discuss (4) JAMB 1989
1390
Mortar is NOT used for under-water construction because
  • A. it hardens by lose of water
  • B. its hardening doe not depend upon evaporation
  • C. it requires concrete to harden
  • D. it will be washed away by the flow of water
View Answer & Discuss (16) JAMB 1989
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