Electrochemistry

$\text{Ca(s)} + \text{Cd}^{2+}\text{(aq)} \rightarrow \text{Ca}^{2+}\text{(aq)} + \text{Cd(s)}$, $[E^0_{\text{Ca}} = -2.866$ V & $E^0_{\text{Cd}} = -0.403$ V$]$

$2\text{Br}^-\text{(s)} + \text{Sn}^{2+}\text{(aq)} \rightarrow \text{Br}_2\text{(l)} + \text{Sn(s)}$, $[E^0_{\text{Br}} = 1.08$ V & $E^0_{\text{Sn}} = -0.136$ V$]$

$2\text{Ag(s)} + \text{Ni}^{2+}\text{(aq)} \rightarrow 2\text{Ag}^+\text{(aq)} + \text{Ni(s)}$, $[E^0_{\text{Ag}} = 0.799$ V & $E^0_{\text{Ni}} = -0.257$ V$]$

$2\text{Au(s)} + \text{Zn}^{2+}\text{(aq)} \rightarrow 2\text{Au}^+\text{(aq)} + \text{Zn(s)}$, $[E^0_{\text{Au}} = 1.68$ V & $E^0_{\text{Zn}} = -0.763$ V$]$