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Chemistry 1990 WAEC Past Questions

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6
Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium
  • A. has a lower density than iron
  • B. is a better conductor than iron
  • C. does not corrode spontaneously
  • D. forms thin layer of inert oxide in moist air
  • E. forms amphoteric oxides while iron does not
View Answer & Discuss WAEC 1990
7

When a solid melts and consequently boils, there is

  • A. a gradual increase in the average kinetic energy of the particles
  • B. a sudden decrease in the kinetic energy of the particles
  • C. no change in the average kinetic energy of the particles
  • D. a rapid change in the nature of bonding of the components
  • E. a change in the size of the fundamental particles
View Answer & Discuss (3) WAEC 1990
8
Which of the following compounds will undergo additional reactions?
  • A. Ethyne
  • B. Butane
  • C. Pentane
  • D. Tetrachloromethane
  • E. Ethanol
View Answer & Discuss (5) WAEC 1990
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9
Which of the following reactions does not occur in the blast furnace during the extraction of iron?
  • A. Fe2O3 (s) + 3CO(g) → 2Fe(l) + 3CO2(g)
  • B. C2 + CO 2(g)
  • C. CaO(s) + SiO2(s) → CaSiO 3(s)
  • D. FeO(s) + CO2(g) + Fe(l)
  • E. 2Fe2O(s) → 4Fe(l) 3O2(g)
View Answer & Discuss WAEC 1990
10
A catayst which increases the rate of a chemical reaction does so by
  • A. increasing the reaction pathway
  • B. increasing the surface area of the reactants
  • C. increasing the pressure on the system
  • D. decreasing the temperature at which the reaction occurs
  • E. decreasing the activation energy of the reaction
View Answer & Discuss WAEC 1990
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