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Chemistry Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
1486
The three-dimensional shape of methane is
  • A. hexagonal
  • B. trigonal
  • C. linear
  • D. tetrahedral
  • E. cubical
View Answer & Discuss (2) JAMB 1983
1487
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.

Compound W is
  • A. a soap
  • B. an oil
  • C. an alkane
  • D. an ester
  • E. sucrose
View Answer & Discuss (7) JAMB 1983
1488
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.

The molecular formula of X is
  • A. C12H22O11
  • B. C6H12O6
  • C. C3H6O 3
  • D. C7H14O7
  • E. C12H6O4
View Answer & Discuss (8) JAMB 1983
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1489
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.

Reaction of X with yeast forms the basis of the
  • A. plastic industry
  • B. textile industry
  • C. brewing industry
  • D. soap industry
  • E. dyeing industry
View Answer & Discuss (4) JAMB 1983
1490
A mixture of common salt, ammonium chloride and barium sulphate can best be separated by
  • A. addition of water followed by filtration then sublimation
  • B. addition of water followed by sublimation then filtration
  • C. sublimation followed by addition of water then filtration
  • D. fractional distillation
  • E. fractional crystallization
View Answer & Discuss (1) JAMB 1983
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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