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Chemistry 1990 WAEC Past Questions

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16
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
17
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 (10) WAEC 1990
18
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
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19
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
20
Which of the following equations represents the reaction leading to the removal of permanent hardness of water?
  • A. Ca(HCO 3)2 → CaCO3 + H2O + CO2
  • B. MgSO4 + Na 2CO3 + Na 2SO
  • C. Ca(OH) 2 + 2HCI → CaCI 2 + 2H 2O
  • D. Ca(HCO3)2 + Ca(OH)3 → 2CaCO3 + 2H2O
  • E. MgSO4 + BaCI2 → MgCI2 + BaSO4
View Answer & Discuss (3) WAEC 1990
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
WAEC offline past questions - with all answers and explanations in one app - Download for free