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Chemistry 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
2716

Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations. If all the marble chips reacted; which of the following remained the same in each case?

  • A. Average rate of evoluton of gas
  • B. Total mass of gas evolved during the reaction
  • C. Time taken for the reaction to reach completion
  • D. Initial reaction rates
View Answer & Discuss (2) WAEC 2002
2717
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
2718
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
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2719
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
2720

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
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