Light green crystals of ferrous sulphate...

Light green crystals of ferrous sulphate lose water molecules and turn brown on exposure to air. This is due to its oxidation to

`Fe_(2) O_(3)`

`Fe_(2) O_(3). H_(2) O`

`Fe (OH) SO_(4)`

`Fe_(2) O_(3) + Fe O`

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The correct Answer is:

`Fe(OH)SO_(4)`
`FeSO_(4) overset(H_(2)O)rarr Fe(OH)SO_(4)`

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