A compound of iron exists as a dimer in vapour state. It is hygroscopic in nature and disolves in water giving brown acidic solu

Correct Answer - C
(3) `FeCl_(3)` exist as `Fe_(2)Cl_(6)` (a dimer) in vapour state. The solution is acidic due to the formation of HCl and brown due to the formation of ` Fe(OH)_(3)`.
`FeCl_(3)+3H_(2)OtoFe(OH)_(3)("brown")+3HCl`

A compound of iron exists as a dimer in vapour state. It is hygroscopic in nature and disolves in water giving brown acidic solution. The compound is

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