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Account for the following observation an...

Account for the following observation and write balanced chemical equations for them.
(i). When ferrous sulphate crystals are exposed to air, it turns brown.
(ii). A solution of ferric chloride in water gives a brown precipitate on standing.

Text Solution

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(i). It turns brown due to oxidation into the ferric compound by atmospheric oxygen.
`2FeSO_4overset(Delta)toFe_2O_3+SO_3`
(ii). Formation of brown ppt. is due to `Fe(OH)_3`.
`FcCl_3+3H_2OtoFe(OH)_3+3HCl`
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