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Chemistry JAMB Past Questions

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1326

When ammonium, potassium and calcium carbonates are each separately heated

  • A. none of them will decompose
  • B. each of them will decompose to give carbondioxide and the respective oxide
  • C. ammonium carbonate and potassium carbonate will not decompose
  • D. only ammonium carbonate and the respective oxide
  • E. ammonium carbonate will decompose to give carbondioxide, water and ammonia
View Answer & Discuss (8) JAMB 1979
1327

If chlorine gas is bubbled into water and then this yellowish-green coloured solution is exposed to bright sunlight for a while

  • A. the solution will give out chlorine gas and hydrogen chloride gas
  • B. the solution will produce chlorine gas and oxygen
  • C. the solution will give out solution will producing hypochloric acid
  • D. the solution is decomposed giving out oxygen, hydrogen and chlorine
  • E. the solution will give out oxygen gas leaving behind aqueous hydrochloric acid
View Answer & Discuss (11) JAMB 1979
1328

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
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1329

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
1330
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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