Question

aluminium vessel is used to store ferrous sulphate solution it is observed that in a few days whole appear in the vessel explain the observation and give the chemical equation in support of your answer

Answer 1

Aluminium is more reactive than iron. Aluminium from the walls can react with ferrous sulphate to form its sulphate and iron is precipitated.  
2FeSO4 + 2Al →   Al2(SO4)3 + 3Fe . 

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