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Chemistry Past Questions

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1421
The hybridization of the carbon atom in ethyne is
  • A. sp 4
  • B. sp 3
  • C. sp2
  • D. sp
  • E. s
View Answer & Discuss (16) JAMB 1984
1422

An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is
Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )

  • A. C3H6O2N
  • B. C5H6O2N
  • C. (C5H7O2N)1/2
  • D. C5H7O2N
  • E. (C5H7O2N)2
View Answer & Discuss (11) JAMB 1984
1423
When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
  • A. polymerization
  • B. refining
  • C. hydrogenation
  • D. cracking
View Answer & Discuss (1) JAMB 1984
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1424
Alkaline hydrolysis of naturally occurring fats and oils yields
  • A. fats and acids
  • B. soaps and glycerol
  • C. margarine and butter
  • D. esters
  • E. detergents
View Answer & Discuss (1) JAMB 1984
1425
Which of the following statements is INCORRECT?
  • A. Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
  • B. Butane < petrol < kerosene of polythene.
  • C. Both but-1-ene and but-1-yne will decolorize bromine readily
  • D. but-2-ene will react with chlorine to form 2,3-dichlorobutane
  • E. calcuim carbide will react with water to form any alkyne
View Answer & Discuss (17) JAMB 1984
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