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Chemistry WAEC Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
271
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
272
Which of the following oxides is amphoteric?
  • A. Na2O
  • B. Fe2O3
  • C. AI2O3
  • D. CaO
  • E. CuO
View Answer & Discuss (6) WAEC 1985
273
Chlorine is prepared on a large scale by the
  • A. electrolysis of concentrated sodium chloride solution
  • B. action of manganese (IV) oxide on hot concentrated hydrochloric acid
  • C. action of concentrated tetraoxosulphate (IV) acid on sodium chloride
  • D. oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII)
  • E. action of dilute mineral acids on bleaching powder
View Answer & Discuss (2) WAEC 1985
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274

A sample of air that has been passed through caustic potash will

  • A. contain more oxygen than nitrogen
  • B. rekindle a glowing splint
  • C. have no action on lime water
  • D. contain no water vapour
  • E. be free of noble gases
View Answer & Discuss (5) WAEC 1985
275
The existance of two or more forms of the same element in the same physical state is known as
  • A. allotropy
  • B. resonance
  • C. hybridization
  • D. isotopy
  • E. isomerism
View Answer & Discuss (4) WAEC 1996
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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