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Chemistry 2002 WAEC Past Questions

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36
A visible change is observed when a strip of iron is placed in an aqueous solution of
  • A. FeSO4
  • B. ZnSO4
  • C. CuSO4
  • D. MgSO4
View Answer & Discuss (2) WAEC 2002
37

Consider the following equation: Cr\(_2\)O\(_7\)\(^{2-}\)(aq) + 14H\(^+\)(aq) + 6e\(^-\) → 2Cr\(^{3+}\)(ag) + 7H\(_2\)O(1). The oxidation number of chromium changes from

  • A. -2 to + 3
  • B. -2 to + 6
  • C. +6 to +3
  • D. +7 to + 6
View Answer & Discuss (3) WAEC 2002
38
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
  • A. 2.0 mole of Q 3+
  • B. 2.5 mole of R2+
  • C. 3.0 mole of T-
  • D. 4.0 mole of Y-
View Answer & Discuss (2) WAEC 2002
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39
If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the
  • A. smaller mass
  • B. lower electrical charge
  • C. greater stability in solution
  • D. stronger tendency to accept electrons
View Answer & Discuss (3) WAEC 2002
40

When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are

  • A. oxygen and hydrogen
  • B. hydrogen and chlorine
  • C. sodium and oxygen
  • D. sodium and chlorine
View Answer & Discuss (3) WAEC 2002
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