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Chemistry 1999 JAMB Past Questions

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31

A pair of compounds that can be used to generate a gas which has physiological effect on human beings is

  • A. sodium trioxonitrate (V) and calcium chloride
  • B. sodium dioxonitrate (III) and ammonium chloride
  • C. sodium trioxonitrate (V) and ammonium chloride
  • D. sodium dioxonitrate (III) and potassium chloride
View Answer & Discuss (13) JAMB 1999
32
Hydrogen is used in oxy-hydrogen flames for melting metals because it
  • A. evolves a lot of heat when burnt
  • B. combines explosively with oxygen
  • C. is a very light gas
  • D. is a rocket fuel
View Answer & Discuss (5) JAMB 1999
33
What properties of duralumin make it more useful than its constituent metals?
  • A. It is heavy with a high melting point
  • B. It is malleable and has high density
  • C. It is strong and light
  • D. It is hard and ductile
View Answer & Discuss (5) JAMB 1999
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34
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
  • A. magnesium and zinc
  • B. magnesium and calcium
  • C. copper and zinc
  • D. lead and calcium
View Answer & Discuss (8) JAMB 1999
35
A metal that can be extracted from cassitertite is
  • A. cacium
  • B. magnesium
  • C. tin
  • D. copper
View Answer & Discuss (2) JAMB 1999
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