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Chemistry Past Questions

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681
Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?
  • A. (NH4)CO3
  • B. ZnCO3
  • C. Al2(SO4)3
  • D. PbCO3
View Answer & Discuss (9) JAMB 1990
682
A cycloalkane with the molecular formula C5H10 has ?
  • A. one isomer
  • B. two isomers
  • C. three isomers
  • D. four isomers
View Answer & Discuss (34) JAMB 1990
683
The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?
  • A. alkanoate
  • B. alkaene
  • C. alkanol
  • D. alkane
View Answer & Discuss (7) JAMB 1990
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684
Alkaonic acids have low volatility compared with alkanols because they?
  • A. are more polar than alkaonls
  • B. have two oxygen atoms while alkanols have one
  • C. form hydrogen bonds while alkanols do not
  • D. form two hydrogen bonds while alkanols form one
View Answer & Discuss (7) JAMB 1990
685
The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?
  • A. 45
  • B. 55
  • C. 80
  • D. 100
View Answer & Discuss (7) JAMB 1990
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