Why copper sulphate solution cannot be kept on iron vessel?

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Solution

When copper sulphate solution is kept in an iron vessel, the vessel is damaged as iron reacts with copper sulphate. Iron is more reactive than copper and will displace
copper from its salts forming iron salt.

Fe + CuSO₄ $\to$ FeSO₄ (ferrous sulphate) + Cu

This punches holes in the vessel and damages it.

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