A galvanic cell is set up as follows:

$Zn|Z{n}^{2+}||C{d}^{2+}|Cd.$ Write the equations for the half reactions and calculate the theoretical voltage produced by this cell if: $($a$)$ concentrations of $C{d}^{2+}$ and $Z{n}^{2+}$ are $0\mathrm{.}01$mol$/$L; $($b$)$ concentration of $Z{n}^{2+}$ is

$0\mathrm{.}01$mol$/$L and concentration of $C{d}^{2+}$ is

$1$mol$/$L

$2.$Nickel plate is coated with lead. Is this anodic or cathodic coating? Which metal will undergo corrosion when coating is damaged? Give the scheme of electrochemical corrosion in neutral and acidic medium and write equations for the reactions that occur.