74\,\text{V}$
Copper: $\text{Cu}^{2+} + 2\text{e}^- \rightarrow \text{Cu}$, with $E^0_\text{Cu} = +0.34\,\text{V}$
Since the copper half-reaction has a more positive standard reduction potential, it will act as the cathode (reduction occurs), and the chromium
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