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Chemistry 1990 JAMB Past Questions

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6

Iron galvanized with zinc is cathodically protected from corrosion. This is because?

  • A. zinc has a more positive oxidation potential than iron
  • B. zinc has less positive oxidation potential than iron
  • C. bith have the same oxidation potential
  • D. zinc is harder than iron
View Answer & Discuss (11) JAMB 1990
7
Which of the following samples will react fastest with dilute trioxonitrate (V) acid?
  • A. 5 g of lumps of CacO3 at 25°C
  • B. 5 g of powered CacO3 at 25°
  • C. 5 g of lumps of CaCO3 at 50°C
  • D. 5 g of powered CaCO3 AT 50°C
View Answer & Discuss (3) JAMB 1990
8
In the reaction:
2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;

The concentration of iodine in the equilibrium mixture can be increased by?
  • A. raising the pressure
  • B. raising the temperature
  • C. adding a catalyst
  • D. lowering the pressure
View Answer & Discuss (9) JAMB 1990
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9
Which of the following gases can be collected by the upward displacement of air?
  • A. NO
  • B. H 2
  • C. NH3
  • D. Cl 2
View Answer & Discuss (18) JAMB 1990
10

The brown fumes given off when trioxonitrate (V) acid is heated consist of ?

  • A. NO2 and O2
  • B. H2O and NO2
  • C. NO2' O2 and H2O
  • D. NO, NO2 and H2O
View Answer & Discuss (16) JAMB 1990
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