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926
Which of the following gases is the most dangerous pollutant?
  • A. Hydrogen sulphide
  • B. Carbon (lV) oxide
  • C. Sulphur (lV) oxide
  • D. Carbon (ll) oxide
View Answer & Discuss (9) JAMB 1997
927

A major process involved in the softening of hard water is the?

  • A. conversion of a soluble calcium salt to its trioxoncarbonate (lV)
  • B. decomposition of calcium trioxocarbonate (lV)
  • C. conversion of an insoluble calcium salts to its trioxocarbonate (lV)
  • D. oxidation of calcium atoms to its ions
View Answer & Discuss (4) JAMB 1997
928
A saturated solution of AgCl was found to have a concentration of 1.30 x 10-5 mol dm-3. The solubility product of AgCl therefore is?
  • A. 1.30 x 10-5 mol2 dm-6
  • B. 1.30 x 10-7 mol2 dm-6
  • C. 1.69 x 10-10 mol2 dm-6
  • D. 2.60 x 10-12 mol2 dm-6
View Answer & Discuss (12) JAMB 1997
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929
The hydroxyl ion concentrated, (OH-), in a solution of sodium hydroxide of pH 10.0 is?
  • A. 10-10 mol dm-3
  • B. 10-6 mol dm-3
  • C. 10-4 mol dm-3
  • D. 10-2 mol dm-3
View Answer & Discuss (14) JAMB 1997
930

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

  • A. 13.0
  • B. 7.0
  • C. 6.5
  • D. 3.0
View Answer & Discuss (8) JAMB 1997
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