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Chemistry 1997 JAMB Past Questions

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31

The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?

  • A. hydrolysis of the iron
  • B. reaction of acid with base
  • C. oxidationof the rust
  • D. dehydration of the iron
View Answer & Discuss (24) JAMB 1997
32
Which of the additives could improve the quality of steel?
  • A. Silicon
  • B. Sulphur and phosphorus
  • C. Carbon
  • D. Chromium and nickel
View Answer & Discuss (4) JAMB 1997
33
Sodium hydroxide is prepared commercially from sodium chloride solution by?
  • A. electrolysis using mercury as cathode
  • B. hydrolysis in steam using a catalyst
  • C. electrolysis using iron as anode
  • D. treating sodium chloride with ammonia and carbon (IV) oxide
View Answer & Discuss (2) JAMB 1997
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34
A sample of a substance containing only C and H burns in excess O2 to yield 4.4g of CO2
and 2.7 g of H2O. The empirical formula of a substance is?

(C = 12, O = 16, H = 1)
  • A. CH3
  • B. CH2
  • C. CH4
  • D. C2H24
View Answer & Discuss (25) JAMB 1997
35
An undesirable paraffin in the petroleum industry which is particularly prone to knocking is?
  • A. iso-octane
  • B. n-heptane
  • C. iso-heptane
  • D. n-octane
View Answer & Discuss (5) JAMB 1997
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