Question
Why does a new aluminium vessel lose shine so soon after use?
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$\text{Fe}_2\text{O}_3\ +\ 2\text{Al(s)}\ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ }\text{Al}_2\text{O}_3(\text{s})\ +\ 2\text{Fe(t)}$
$2\text{FeSO}_4(\text{s})\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Fe}_2\text{O}_3\ +\ \text{SO}_2(\text{g})\ +\ \text{SO}_3(\text{g})$
$\text{NH}_3(\text{g})\ +\ \text{HCl(g)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{NH}_4\text{Cl(s)}$
$\text{CuSO}_4(\text{aq})\ +\ \text{H}_2\text{S(g)}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{CuS(s)}\ +\ \text{H}_2\text{SO}_4(\text{aq})$