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Chemistry WAEC Past Questions

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266
The function of limestone in the extraction of iron in the blast furnace is
  • A. removal of the earthly impurities
  • B. decomposition of the iron ore
  • C. conversion of iron (lll) to iron (ll) compounds
  • D. generation of heat for the process
  • E. conversion of coke to carbon(ll)oxide
View Answer & Discuss WAEC 1995
267
Metals which react with steam only when they are red-hot include
  • A. copper
  • B. sodium
  • C. calcium
  • D. gold
  • E. iron
View Answer & Discuss WAEC 1995
268
Copper (ll) tetraoxosulphate (VI) is often added to swimming pools because it
  • A. prevents the growth of algae
  • B. coagulates suspended particles
  • C. neutralizes dissolved gases in water
  • D. reacts with any excess chlorine present
  • E. increases the amount of dissolved oxygen
View Answer & Discuss (1) WAEC 1995
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269
The following salts dissolve readily in cold water except
  • A. CaCI2
  • B. PbSO4
  • C. (NH4)2SO4
  • D. Na2CO3
  • E. Na2SO3
View Answer & Discuss (2) WAEC 1995
270
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
  • A. 0.1 mole
  • B. 0.2mole
  • C. 0.3 mole
  • D. 1.0 mole
  • E. 2.9 moles
View Answer & Discuss (2) WAEC 1995
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