Chemistry

Problem

In the reaction:

\text{Cu}(\text{s}) + 2\text{Ag}^+(\text{aq}) \rightarrow \text{Cu}^{2+}(\text{aq}) + 2\text{Ag}(\text{s})

the reduction half cell reaction is (a)

\text{Cu} + 2\text{e}^- \rightarrow \text{Cu}^{2+}

(b)

\text{Cu} - 2\text{e}^- \rightarrow \text{Cu}^{2+}

(c)

\text{Ag}^+ + \text{e}^- \rightarrow \text{Ag}

(d)

\text{Ag} - \text{e}^- \rightarrow \text{Ag}