Electrochemistry

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1.What occurs during the operation of a voltaic cell based on the following reaction? Ni (s) +Pb2+(aq) → Ni2+(aq) +Pb(s)
External circuitIon movement in solution
A.electrons move from Ni to PbPb2+(aq) move away from Pb(s) B.electrons move from Ni to PbPb2+(aq) move toward Pb(s)
C.electrons move from Pb to NiNi2+(aq) move away from Ni(s) D.electrons move from Pb to NiNi2+(aq) move toward Ni(s)
(2)

2.Which processes occur during the electrolysis of molten sodium chloride? I. Sodium and chloride ions move through the electrolyte.
II. Electrons move through the external circuit.
III. Oxidation takes place at the positive electrode (anode). A.I and II only
B.I and III only
C.II and III only
D.I, II and III
(2)

3.What happens to the Cr3+(aq) ion when it is converted to CrO (aq)? A.Its oxidation number decreases and it undergoes reduction. B.Its oxidation number decreases and it undergoes oxidation. C.Its oxidation number increases and it undergoes reduction. D.Its oxidation number increases and it undergoes oxidation. (2)


4.The following reactions are spontaneous as written.
Fe(s) + Cd2+(aq) → Fe2+(aq) + Cd(s)
Cd(s) + Sn2+(aq) → Cd2+(aq) + Sn(s)
Sn(s) + Pb2+(aq) → Sn2+(aq) + Pb(s)
Which of the following pairs will react spontaneously?
I.Sn(s) + Fe2+(aq)
II.Cd(s) + Pb2+(aq)
III.Fe(s) + Pb2+(aq)
A.I only
B.II only
C.III only
D.II and III only
(2)

5.What species are produced at the positive and negative electrodes during the electrolysis of molten sodium chloride?
Positive electrodeNegative electrode
A.Na+(l)Cl2(g)
B.Cl−(l)Na+(l)
C.Na(l)Cl2(g)
D.Cl2(g)Na(l)
(2)
6.Consider the following reaction.
H2SO3(aq) + Sn4+(aq) + H2O(l) → Sn2+(aq) + HSO (aq) + 3H+(aq)
Which statement is correct?
A.H2SO3 is the reducing agent because it undergoes reduction. B.H2SO3 is the reducing agent because it undergoes oxidation. C.Sn4+ is the oxidizing agent because it undergoes oxidation. D.Sn4+ is the...
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