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Q.

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

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a

Fe3O4

b

FeSO4

c

FeCl3

d

FeO2

answer is C.

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Detailed Solution

The solution is acidic due to formation of HCI and brown due to Fe(OH)3.

Question Image

FeCl3 exists as Fe2Cl6 (a dimer) in vapour state. 

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