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Chemistry 1981 JAMB Past Questions

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36
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
  • A. CO2 + C → 2CO
  • B. 2Fe2O3 + 3C → 4Fe + 3CO2
  • C. Fe2O3 + 3C → 2Fe + 3CO2
  • D. CaCO3 → CaO + CO2
  • E. CaO + SiO2 → CaSiO3
View Answer & Discuss (14) JAMB 1981
37

Pure sulfuric acid is a liquid of 1.84 density. What volume of it would be required to prepare 250 cm3 of 2.0 M solution?



(H = 1, S = 32, O = 16)

  • A. 2.00
  • B. 2.66
  • C. 3.00
  • D. 3.66
  • E. 4.00
View Answer & Discuss (14) JAMB 1981
38
What mass of sodium carbonate solution is in 500 cm3 of 0.1 molar sodium carbonate solution?

(Na = 23, C = 12, O = 16)
  • A. 10.6 g
  • B. 5.3 g
  • C. 500 g
  • D. 10 g
  • E. 20 g
View Answer & Discuss (1) JAMB 1981
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39
Which of the following compounds and elements would sublime on exposure to the atmosphere?
  • A. Ice
  • B. Sulphur
  • C. Phosphurous
  • D. Iodine
  • E. Potassium iodie
View Answer & Discuss (4) JAMB 1981
40
When hydrogen sulphide and sulphur dioxide are each passed in turn into a solution of potassium dichromate?
  • A. both gases change the colour of the solution from yellow to colourless
  • B. both gases causes sulphur to be deposited
  • C. only hydrogen sulphide decolourizes the solution
  • D. only sulphur dioxide deposits sulphur
  • E. only hydrogen sulphide deposits sulphur
View Answer & Discuss (1) JAMB 1981
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