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Chemistry JAMB Past Questions

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1421

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
1422
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
1423
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
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1424
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
1425
Which of the following statements is NOT correct about all four of the acids: HBr, HNO3, H 2CO3 and H2SO4? They
  • A. dissolve marble to liberate CO
  • B. have a PH less than 7
  • C. Turn blue litmus red
  • D. neutralize alkalis to form salt
  • E. react with magnesium to liberate hydrogen
View Answer & Discuss (10) JAMB 1984
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