Question
$\mathrm{Fe}+\mathrm{Cd}^{2+} \rightarrow \mathrm{Cd}+\mathrm{Fe}^{2+}$ will this reaction take place or not?
$\text{E}^0_\frac{\text{Fe}^{2+}}{\text{Fe}}=-0.44\text{V}$
$\text{E}^0_\frac{\text{Cd}^{2+}}{\text{Cd}}=-0.40\text{V}$

Answer

$\text{E}^0_\text{cell}=\text{E}^0_\frac{\text{Cd}^{2+}}{\text{Cd}}-\text{E}^0_\frac{\text{Fe}^{2+}}{\text{Fe}}$
$=-0.40\text{V}-(-0.44\text{V})$
$=+0.04\text{V}$

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