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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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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
A. `Fe_3O_4`
B. `FeSO_4`
C. `FeCl_3`
D. `FeO_3`
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Correct Answer - c
The solution is acidic due to formation of HCl and brown due to `Fe(OH)_3`.
`FeCl_3+3H_2OtoFe(OH)_3+3HCl`
`FeCl_3` exists as `Fe_2Cl_6` (a dimer) in vapour state.
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