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1361
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
1362

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
1363

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
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1364
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
1365
The atomic radius of Li, Na and K are 1: 33A, 1. 54A and 1. 96A res pectively. Which of the following explaqins this gradation in atomic radius?
  • A. electropositivity decreases from Li to Na to K
  • B. electronegativity decreases from Li to Na to K
  • C. the number of the electron shells increases from Li to Na to K
  • D. the elements are in the same period
View Answer & Discuss (5) JAMB 1989
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