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Chemistry Past Questions

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1511

Which of the following separation processes is most likely to yield high quality ethanol (>95%) from palm wine?

  • A. Fractional distillation without a dehydrant
  • B. simple distillation with a dehydrant
  • C. fractional distillation with a dehydrant
  • D. column chromatography
  • E. evaporation
View Answer & Discuss (5) JAMB 1983
1512
Increasing the pressure of a gas
  • A. lowers the average kinetic energy of the molecules
  • B. decreases the density of the gas
  • C. decreases the temperature of the gas
  • D. increases the density of the gas
  • E. increases the volume of the gas
View Answer & Discuss (12) JAMB 1983
1513

2.5 g of a hydrate barium salt gave on heating, 2.13 g of the anhydrous salt. Given that the relative molecular mass of the of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is

  • A. 10
  • B. 7
  • C. 5
  • D. 2
  • E. 1
View Answer & Discuss (14) JAMB 1983
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1514

3. 06 g of a sample of potassium trioxochlorate (V) (KCIO\(_3\)) was required to make a saturated solution with 10cm\(^3\) of water at 25°C. The solubility of the salt at 25°C is [K =39, Cl = 35.5, O = 16]

  • A. 5.0 moles dm3
  • B. 3.0 moles dm3
  • C. 2.5 moles dm3
  • D. 1.0 molesv
  • E. 0.5 moles dm3
View Answer & Discuss (7) JAMB 1983
1515
The cracking process is very important in the petroleum industry because it.
  • A. gives purer products
  • B. yields more lubricants
  • C. yields more engine fuels
  • D. yields more asphalt
  • E. yields more candle wax
View Answer & Discuss (2) JAMB 1983
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