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Problem
Which changes could take place at the positive electrode (cathode) in a voltaic cell? I.
Zn
2
+
(
aq
)
\text{Zn}^{2+}(\text{aq})
Zn
2
+
(
aq
)
to
Zn
(
s
)
\text{Zn}(\text{s})
Zn
(
s
)
II.
Cl
2
(
g
)
\text{Cl}_2(\text{g})
Cl
2
(
g
)
to
Cl
−
(
aq
)
\text{Cl}^-(\text{aq})
Cl
−
(
aq
)
III.
Mg
(
s
)
\text{Mg}(\text{s})
Mg
(
s
)
to
Mg
2
+
(
aq
)
\text{Mg}^{2+}(\text{aq})
Mg
2
+
(
aq
)
a. I and II only b. I and III only c. II and III only d. I, II and III
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