The emf of the cell $Zn |Zn^{2+} (1.0 \;M) ||cd^{2+}(1.0\;M) |cd$ is

Question

$\begin{array}{1 1} cd \to cd^2+2e^{-} \\ Zn^{2+} \to Zn-2e^{-}\\ cd +Zn^{2}+ \to cd^{2+} +Zn \\ Zn+cd^{2+} \to cd +zn^{2+} \end{array} $