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Chemistry 1997 JAMB Past Questions

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11
200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm3. Estimate the percentage of oxygen in the air?
  • A. 31%
  • B. 27%
  • C. 21%
  • D. 19%
View Answer & Discuss (2) JAMB 1997
12
On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO4. yH2O. The value of y is?

(Mg = 24, S = 32, O = 16, H = 1)
  • A. 1
  • B. 3
  • C. 5
  • D. 7
View Answer & Discuss (9) JAMB 1997
13
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
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14

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
15
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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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now