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Chemistry 1989 WAEC Past Questions

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16
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
17
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
18
The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H 2(aq) + H 2(g) can be increased by
  • A. using Zinc powder instead of Zinc granules
  • B. using dilute instead of concentrated hydrochloric acid
  • C. cooling the container in which the mixture is placed
  • D. using an alloy of zinc instead of pure zinc
  • E. using hydrogen chloride gas instead of hydrochloric acid solution
View Answer & Discuss (3) WAEC 1989
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19
Octane number is highest in petrol containing a high proportion of
  • A. heptane
  • B. octane
  • C. 2-methylpentane
  • D. 2, 4-dimethylpentane
  • E. 2,2,4-trimethylpentane
View Answer & Discuss WAEC 1989
20
Given the following half-cell reaction; 2Cl(aq) → CI2(g) + 2e, how many mole of electrons will be required to produce 1.12dm3 of chlorine gas at s.t.p? (Molar volume of a gas at s.t.p. = 22.4dm 3)
  • A. 1.00
  • B. 0.40
  • C. 0.20
  • D. 0.10
  • E. 0.01
View Answer & Discuss (2) WAEC 1989
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