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Chemistry 1994 JAMB Past Questions

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21

What volume of Oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?
(Molar volume of gas = 22.4 dm\(^3\), 1F = 96,500 C/mol)

  • A. 22.4 dm3
  • B. 11.2 dm3
  • C. 1.12 dm3
  • D. 0.560 dm3
View Answer & Discuss (30) JAMB 1994
22
Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is?
  • A. made both the anode and the cathode
  • B. made the cathode
  • C. made the anode
  • D. dissolved in the solution
View Answer & Discuss (2) JAMB 1994
23
H- + H2(I)O → H2(g) + OH-(aq). From the equation above, it can be inferred that the?
  • A. reaction is a double decomposition
  • B. hydride ion is a reducing agent
  • C. hydride ion is an oxidizing agent
  • D. reaction is neutralization
View Answer & Discuss (5) JAMB 1994
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24

An anhydride is an oxide of non-mental

  • A. which will not dissolve in water
  • B. whose solution in water has a pH greater than 7
  • C. whose solution in water has a pH less than 7
  • D. whose solution in water has a pH of 7
View Answer & Discuss (4) JAMB 1994
25
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from?
  • A. +7 to +2
  • B. +6 to +2
  • C. +5 to +2
  • D. +4 to +2
View Answer & Discuss (12) JAMB 1994
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