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Chemistry 2018 JAMB Past Questions

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41

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;

  • A. nitrogen and carbondioxide
  • B. the rare gases
  • C. nitrogen and oxygen
  • D. nitrogen and the rare gases
View Answer & Discuss (3) JAMB 2018
42

In the laboratory preparation of oxygen, the gas cannot be collected by downward displacement of air because

  • A. the density of oxygen is greater than that of air
  • B. the density of air is nearly the same as that of oxygen
  • C. oxygen is a component of air
  • D. air is an impure substance
View Answer & Discuss (10) JAMB 2018
43

2KClO\(_3\)(s) → 2KCl(s) + 3O\(_2\)(g)
The importance of the catalyst in the reaction above is that

  • A. heating may not be required before the reaction takes place
  • B. the reaction is controllable even at a high temperature
  • C. the reaction produces large quantity of oxygen
  • D. the reaction takes place more rapidly at a lower temperature
View Answer & Discuss (3) JAMB 2018
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44

Which of the following is used to power steam engines?

  • A. lubricating oil
  • B. coal
  • C. bitumen
  • D. diesel oil
View Answer & Discuss (3) JAMB 2018
45

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

  • A. 5cm\(^3\)
  • B. 10cm\(^3\)
  • C. 20cm\(^3\)
  • D. 50cm\(^3\)
View Answer & Discuss (6) JAMB 2018
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