$+2$ and $+1$

$+2$ and $-1/2$

$+1$ and $-1/2$

$-2$ and $-1$

$\text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2$

$\text{Al(OH)}_3 + 3\text{HCl} \rightarrow \text{AlCl}_3 + 3\text{H}_2\text{O}$

$\text{Mg} + 1/2 \text{O}_2 \rightarrow \text{Mg}^{2+} + \text{O}^{2-}$

$\text{Fe}_{(s)} + \text{Cu}^{2+}_{(aq)} \rightarrow \text{Fe}^{2+}_{(aq)} + \text{Cu}_{(s)}$

$-9$

$+7$

$-7$

$+9$

-2

+2

zero