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1986
Which of the following ions will migrate to the cathode during electrolysis?
  • A. Zinc ions
  • B. Chloride ions
  • C. Sulphide ions
  • D. Tetraoxosulphate (Vl) ions
  • E. Trioxonitrate (V) ions
View Answer & Discuss WAEC 1997
1987
What quantity of electrons (in mole) is lost when one mole of iron (ll) ions is oxidized to iron (lll) ions?
  • A. 5 mole
  • B. 4 mole
  • C. 3 mole
  • D. 2 mole
  • E. 1 mole
View Answer & Discuss WAEC 1997
1988
The common feature of reactions at the anode is that
  • A. electrons are consumed
  • B. oxidation is involved
  • C. ions are reduced
  • D. the electrode dissolves
  • E. the electrolyte is diluted
View Answer & Discuss (2) WAEC 1997
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1989
From the following equations, what is the order of decreasing reactivity of X, Y and Z? Y (s) + X2+(aq) → Y2+(aq) + X(s) X(s) + Z2+(aq) → X2+(aq) + Z(s)
  • A. X>Y>Z
  • B. Y > X > Z
  • C. Z > Y > X
  • D. Y > Z > X
  • E. X > Z > Y
View Answer & Discuss (4) WAEC 1997
1990
What is the value of x in the following equation? MnO- 4 + 4H+ + xe- → MnO 2 + 2H2O
  • A. 2
  • B. 3
  • C. 4
  • D. 7
  • E. 8
View Answer & Discuss (1) WAEC 1997
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