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1711

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

  • A. isotopy
  • B. isomerism
  • C. allotropy
  • D. hygroscopy
  • E. sublimation
View Answer & Discuss (2) WAEC 1989
1712
Which of the following carbohydrates does NOT usually occur in the crystalline form?
  • A. Fructose
  • B. Glucose
  • C. Sucrose
  • D. Maltose
  • E. Cellulose
View Answer & Discuss (2) WAEC 1989
1713
Copper can best be purified by
  • A. roasting the impure copper in a blast furnace
  • B. heating the oxide with coke
  • C. electrolyzing a copper (ll) salt solution using the impure copper as the anode
  • D. converting the impure copper to a trioxonitrate (V)
  • E. washing the impure copper with sodium hydroxide solution
View Answer & Discuss WAEC 1989
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1714
Locally produced soap in which wood ash is used as the base is usually soft because the wood ash contains a lot of
  • A. sodium ions
  • B. potassium ions
  • C. lithium ions
  • D. calcium ions
  • E. magnesium ions
View Answer & Discuss (4) WAEC 1989
1715
Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?
  • A. Pure sodium chloride does not conduct electricity
  • B. Potassium fluoride prevents the sodium produced from attacking the electrodes
  • C. Potassium fluride increases conductivity
  • D. Potassium fluride reduces the temperature at which sodium chloride fuses
  • E. the potassium fluride acts as a catalyst
View Answer & Discuss (2) WAEC 1989
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