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1931
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
1932
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
1933
Which of the following oxides is amphoteric?
  • A. Na2O
  • B. Fe2O3
  • C. AI2O3
  • D. CaO
  • E. CuO
View Answer & Discuss (6) WAEC 1985
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1934
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
1935

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
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