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Chemistry 2011 JAMB Past Questions

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26
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
  • A. 5H+(aq)
  • B. 4H+(aq)
  • C. 10H+(aq)
  • D. 8H+(aq)
View Answer & Discuss (9) JAMB 2011
27
Given that M is the mass of a substance deposited during electrolysis and Q is the quantity of electricity consumed, then Faraday's first law can be written as
[Electrochemical equivalent]
  • A. M = E/Q
  • B. M = EQ
  • C. M = Q/E
  • D. M = E/2Q
View Answer & Discuss (11) JAMB 2011
28

The impurities formed during the laboratory preparation of chlorine gas are removed by

  • A. H2O
  • B. NH3
  • C. H2SO4
  • D. HCl
View Answer & Discuss (13) JAMB 2011
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29
The effect of the presence of impurities such as carbon and sulphur on iron is that they
  • A. give it high tensile strenght
  • B. make it malleable and ductile
  • C. increase its melting point
  • D. lower its melting point
View Answer & Discuss (14) JAMB 2011
30

A few drops of concentrated HNO\(_3\) is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

  • A. Pb2+
  • B. Cu2+
  • C. Fe3+
  • D. Fe2+
View Answer & Discuss (15) JAMB 2011
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