A compound of iron exists as a dimer in vapour state. It is hygroscopic in nature and dissolves in water…

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
  1. $\mathrm{Fe}_{3} \mathrm{O}_{4}$
  2. $\mathrm{FeSO}_{4}$
  3. $\mathrm{FeCl}_{3}$
  4. $\mathrm{FeO}_{2}$

Solution

The solution is acidic due to formation of $\mathrm{HCl}$ and brown due to $\mathrm{Fe}(\mathrm{OH})_{3}$
$\mathrm{FeCl}_{3}+3 \mathrm{H}_{2} \mathrm{O} ightarrow \mathrm{Fe}(\mathrm{OH})_{3}+3 \mathrm{HCl}$ ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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