A voltaic cell is constructed from a half-cell in which a chromium rod dips into a solution

Question:

A voltaic cell is constructed from a half-cell in which a chromium rod dips into a solution of chromium(III) nitrate, Cr(NO3)3, and another half-cell in which a lead rod dips into a solution of lead(II) nitrate, Pb(NO3)2. The two half-cells are connected by a salt bridge. Chromium metal is oxidized during operation of the voltaic cell. What is the half-reaction that occurs at the cathode?