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2271
Which of the following is required in an experiment to determine the enthalpy of solution of anhydrous CuSO? l. Mass of the anhydrous CuSO 4 II. Volume of water in which the CuSO4 is dissolved lll. lnitial temperature of water lV. Final temperature of the solution
  • A. l and ll only
  • B. lll and IV only
  • C. ll, lll, and IV only
  • D. l, ll, lll, and IV only
View Answer & Discuss (2) WAEC 2004
2272
Which of the following pollutants is biodegradable?
  • A. Domestic sewage
  • B. Metal scraps
  • C. Radioactive waste
  • D. Plastic foil
View Answer & Discuss WAEC 2004
2273
The process of seeding during the extraction of aluminium involves the addition of pure AI(OH)3 crystals in order to
  • A. lower the temperature
  • B. increase the concentration
  • C. facilitate the precipitation of solid
  • D. reduce the viscosity of the solution
View Answer & Discuss (2) WAEC 2004
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2274
Which of the following measures is not suitable for controlling water pollution?
  • A. treating industrial effluent and domestic sewage before discharge into water
  • B. Controlling the use of agrochemicals
  • C. recycling industrial and agricultural wastes
  • D. burning industrial and agricultural wastes before discharge into water ways
View Answer & Discuss WAEC 2004
2275
The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X
  • A. Belongs to group 6 of the Periodic Table
  • B. Belongs to group IV of the Periodic Table
  • C. has 3 unpaired electrons in its atom
  • D. has relative molecular mass of 16
View Answer & Discuss (5) WAEC 2005
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