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Chemistry 1981 JAMB Past Questions

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26

When air is compressed?

  • A. its density decreases
  • B. it solidifies
  • C. its temperature decreases
  • D. its temperature increases
  • E. its temperature remains unchanged
View Answer & Discuss (15) JAMB 1981
27
Fats and oils are?
  • A. addition products of long chain fatty acids and alkali
  • B. addition products of long-chain fattyy acids and glycerol
  • C. condensation products of long-chain fatty acids and glycerol
  • D. condensation products of formaldehyde and glycerol
  • E. liquids at 20°C
View Answer & Discuss (3) JAMB 1981
28

Which of the following statements about phosphorus is NOT correct?

  • A. Phosphorus is a solid mineral
  • B. Phosphorus is obtained by oxidation reaction of phosphate
  • C. Phosphorus exists in two allotropic forms
  • D. Both forms of phosphorus are interconvertible
  • E. Yellow phosporus ignites when rubbed on a rough surface
View Answer & Discuss (7) JAMB 1981
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29
28.8 cm3 of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?
  • A. 17.4 cm3
  • B. 14.7 cm3
  • C. 27.3 cm3
  • D. 31.7 cm3
View Answer & Discuss (7) JAMB 1981
30
If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?
  • A. 48,000
  • B. 96,000
  • C. 192,000
  • D. 384,000
  • E. 576,000
View Answer & Discuss (2) JAMB 1981
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