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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
1746
The compound of copper which is used in electroplating dyeing, printing, wood preservation and as a fungicide is
  • A. copper (ll) hydroxide
  • B. copper (ll) trioxonitrate (V) pentahydrate
  • C. copper (ll) tetraoxosulphate (VI) pentahydrate
  • D. copper (ll) oxide
  • E. copper (ll) trioxocarbonate (lV)
View Answer & Discuss WAEC 1990
1747
What is the molecular formula of a compound whose empirical formula is CH2O and molar mass is 180? (H = 1, C = 12, O = 16)
  • A. C 4H 8O2
  • B. C 4H 8O3
  • C. C 6H 10O5
  • D. C 6H 12O6
  • E. C 12H 22O11
View Answer & Discuss (2) WAEC 1990
1748
MO and X 2O represent the formula of oxides of elements M and X respectively . If M and X should combine to form a separate compound, what would be the formula of the compound?
  • A. MX2
  • B. M2X
  • C. MX
  • D. M3X2
  • E. MX3
View Answer & Discuss (12) WAEC 1990
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1749
Which of the following pollutants is biodegradable ?
  • A. Sewage
  • B. Plastics
  • C. Metal scrape
  • D. Lead compounds
  • E. Hydrogen sulphide
View Answer & Discuss WAEC 1990
1750
In the reaction represented by the equation; 2FeCI3 + SO2 + 2H2O → 2FeCL2 + H2SO4 + 2HCI the oxidation number of sulphur changes from
  • A. +2 to + 6
  • B. + 4 to + 6
  • C. 0 to + 6
  • D. - 2 to + 4
  • E. +2 to + 4
View Answer & Discuss (2) WAEC 1990
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