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Chemistry 1979 JAMB Past Questions

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16

12 g of solid protassium chlorate (KCIO) were added to 40 g of water and heated to dissolve all the solid. As the solution cools, crystals of potassium chlorate at 66 oC. The solubility of potassium chlorate at 66 oC is therefore?

  • A. 66
  • B. 33
  • C. 10
  • D. 20
  • E. 30
View Answer & Discuss (17) JAMB 1979
17

In the electrolysis of dilute sulphuric acid using platinum electrodes, the products obtained at the anode and cathode are:
Anode Cathode

  • A. Sulphur hydrogen
  • B. Hydrogen oxygen
  • C. Oxygen Hydrogen
  • D. Hydrogen sulphate ions
  • E. Sulphur oxygen
View Answer & Discuss (11) JAMB 1979
18
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
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19
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
20
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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