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Chemistry Past Questions

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1331
The empirical formula of an oxide of nitrogen containing 30.4 per cent of nitrogen is (N=14.0,O=16.0)
  • A. N2O2
  • B. NO
  • C. NO2
  • D. N2O
  • E. N2O3
View Answer & Discuss (10) JAMB 1979
1332
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
1333
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
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1334
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
1335

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
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