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Chemistry WAEC Past Questions

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1056
CuSO45H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
  • A. evaporation to dryness
  • B. using chromatography
  • C. precipitation
  • D. crystallization
View Answer & Discuss (1) WAEC 2002
1057
Which of the following compounds will leave a metal residue when heated?
  • A. Cu(NO3)2
  • B. AgNO3
  • C. K2CO3
  • D. CaCO3
View Answer & Discuss (1) WAEC 2002
1058
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
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1059

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
1060
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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