A solution of ferrous sulphate was kept in an aluminium can. After few days, the can was found to have a number of holes in it. Explain the observation and write the chemical equation involved.

Explanation

Aluminium is more reactive than iron. So, when aluminium can is used to store ferrous sulphate solution, aluminium displaces iron from ferrous sulphate solution forming aluminium sulphate and iron. Thus, when aluminium can is used to store ferrous sulphate solution, holes develop in the can in a few days.
`underset"Ferrous sulphate "(3FeSO_(4(aq))) + underset"Aluminium"(2Al_((s))) to underset"Aluminium sulphate"(Al_2(SO_4)_(3(aq))) + underset"Iron"(3Fe_((s)))`