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926

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
927
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
928
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
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929

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
930
Given that 15.00 cm3 of H2
SO4 was required to completely neutralize 25.00 cm3 of 0.125 mol dm-3 NaOH, calculate the molar concentration of the acid solution:
  • A. 0.925 mol dm-3
  • B. 0.156mol dm-3
  • C. 0.104 mol dm-3
  • D. 0.023 mol dm-3
View Answer & Discuss (5) JAMB 1997
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