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891

In the process of silver-plating a metal M, the metal M is the?

  • A. anode and a direct current is used
  • B. cathode and an alternating current is used
  • C. anode and an alternating current is used
  • D. cathode and a direct current is used
View Answer & Discuss (13) JAMB 1995
892
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?

(F = 96 500 C mol-)
  • A. 0.5
  • B. 1.0
  • C. 1.5
  • D. 3.0
View Answer & Discuss (1) JAMB 1995
893
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is?
  • A. ionization
  • B. oxidation
  • C. reduction
  • D. recombination
View Answer & Discuss (6) JAMB 1995
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894
Which of the following is a redox reaction?
  • A. KCI(aq) + H2SO4(aq) → KHSO4(aq) + HCI(aq)
  • B. 2FeBr2(aq) + Br4(aq) → 2FeBr3(aq)
  • C. 3AgNO(aq) + FeCl3(aq) → 3AgCl(aq) + Fe(NO3)3(aq)
  • D. H2CO3(aq) → H2O(I)2- + CO2(g)
View Answer & Discuss (7) JAMB 1995
895

Cr\(_2\)O\(_7\)\(^{2-}\)(aq) + 14H\(^+\)(aq) + 6l\(^-\)(aq) → 2Cr\(^{3+}\)(aq) + 3l(g) + 7H\(_2\)O(I).
The change in the oxidation number of oxygen in the equation above is?

  • A. 0
  • B. 1
  • C. 2
  • D. 7
View Answer & Discuss (16) JAMB 1995
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