The oxidation states of iodine in h 4 io 6 and sulfur

9. The oxidation states of iodine in H
4
IO
6
- and sulfur in H
2
SO
3
are, respectively
a. -1, 0
b. +6, -2
c. +7, +4
d. +6, +4
e. +7, -4

Practice Exam 3 Questions
10. Using the information above, which of the following reactions below will occur
spontaneously as written?
2+
(aq)
2+
(aq)
Fe (s)
2+
(aq)
(aq)
11. The standard cell potential (E°
cell
) for the voltaic cell based on the reaction below is
________ V. Use the table above.
2Cr (s) + 3Fe
2+
(aq) → 3Fe (s) + 2Cr
3+
(aq)
12. A concentration cell is constructed with copper electrodes and Cu
2+
in each compartment. In
one compartment, the [Cu 2+ ] = 1.0 x 10 – 3 M and in the other compartment, the [Cu 2+ ] = 2.0 M
Calculate the potential for this cell at 25°C. The standard reduction potential for Cu
2+
is +0.34 V.
.
13. The standard cell potential (E° cell) for the reaction below is +0.63 V. The cell potential
(E
cell
) for this reaction is ________ V when [ Zn
2+
] = 3.0 M and [Pb
2+
] = 2.0 × 10
-4
M.
Pb
2+
(aq) + Zn (s) → Zn
2+
(aq) + Pb (s)
a. 0.51
b. 0.86
c. 0.40
d. 0.75
e. 0.63

Practice Exam 3 Questions