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Chemistry 1989 JAMB Past Questions

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1
Which of the following would support the conclusion that a solid sample is a mixture?
  • A. the solid can be ground to a fine powder
  • B. the density of the solid is 2.25 g dm3
  • C. the solid has a melting range of 300oC to 375oC
  • D. the solid absorbs moisture from the atmosphere
View Answer & Discuss (7) JAMB 1989
2
The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm3 of vapour. The molecular formula of the liquid is
[G.M.V =22.4 dm 3, C = 12, H = 1]
  • A. C 3 H 6
  • B. C 4H 8
  • C. C 5C 10
  • D. C 6H 12
View Answer & Discuss (17) JAMB 1989
3

20.00 cm\(^3\) of a solution containing 0.53 g of anhydrous Na\(_2\)CO\(_3\) in 100 cm\(^3\) requires 25.00 cm\(^3\) of H\(_2\)SO\(_4\) for complete neutralisation. The concentration of the acid solution in moles per dm\(^3\) is [H =1, C = 12, O = 16, Na =23, S = 32]

  • A. 0.02
  • B. 0.04
  • C. 0.06
  • D. 0.08
View Answer & Discuss (22) JAMB 1989
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4

The minimum volume of oxygen required for the complete combustion of a mixture of 10cm 3 of CO and 15 cm 3 of H 2 is

  • A. 25.0cm3
  • B. 12.5 cm3
  • C. 10.0 cm3
  • D. 5.0cm3
View Answer & Discuss (17) JAMB 1989
5
What is the partial pressure of hydrogen gas collected
over water at standard atmospheric pressure and 25 oC if the saturation vapour pressure of water at saturation vapour pressure of water is 23 mm Hg at that temperature?
  • A. 737 mm Hg
  • B. 763 mm Hg
  • C. 777 mm Hg
  • D. 783 mm Hg
View Answer & Discuss (12) JAMB 1989
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