Home Chemistry D and F - Block Elements General A compound of iron exists as a dimer in vapo…
Chemistry D and F - Block Elements General Single Correct MCQ
Published on: August 13, 2026

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 :

A
Fe 3 O 4
B
FeSO 4
C
FeCl 3
D
FeCl 2 .

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Verified by Experts
The correct answer is:
C

FeCl 3 exists 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 O → Fe(OH) 3 (Brown) + 3HCl

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