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Chemistry JAMB Past Questions

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1331
When a piece of charcoal enclosed in a cylinder containing air is ignited
  • A. the toatl volume of air is increased
  • B. the relative amount of oxygen present is increased
  • C. the relative amount of nitrogen present is decreased
  • D. the relative amount of carbondioxide present is increased
  • E. the ratio of oxygen to nitrogen in the system is increased
View Answer & Discuss (2) JAMB 1979
1332
Indicate which of the following statements is not true as we move from left to right along the periodic Table:
  • A. atomic number of elements increases
  • B. atomic mass of elements increases
  • C. electropositive character of elements increases
  • D. electronegative character of elements increases
  • E. number of electrons in the outermost orbits of element increases
View Answer & Discuss (13) JAMB 1979
1333
0.1 Faraday of electricity was passed through a solution of copper (ll) sulphate. The maximum weight of copper deposited on the cathode would be [Cu = 64]
  • A. 64.0g
  • B. 32.0g
  • C. 16.0g
  • D. 6.4 g
  • E. 3.2g
View Answer & Discuss (8) JAMB 1979
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1334

Which one of these compounds will NOT give an oxygen gas on heating?

  • A. Manganese dioxide
  • B. Hydrogen peroxide
  • C. Zinc nitrate
  • D. Sodium nitrate
  • E. Ammonium nitrate
View Answer & Discuss (13) JAMB 1979
1335
In the extraction of aluminum from purified bauxite by electrolysis, cryolite is used because
  • A. it makes bauxite a better conductor of electricity
  • B. it makes bauxite melt at a lower temperature
  • C. it makes aluminium purer
  • D. it prevents aluminium from getting oxidized
  • E. it protects the carbon electrodes used in the process
View Answer & Discuss (12) JAMB 1979
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