$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}ight)_{5} \mathrm{NO}ight]^{2+}$ is brown-ring complex in…

$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}ight)_{5} \mathrm{NO}ight]^{2+}$ is brown-ring complex in $\mathrm{NO}_{3}^{-}$. In this complex:
  1. $\mathrm{NO}$ transfers its electron to $\mathrm{Fe}^{2+}$ so that
    there are three electrons unpaired making iron as $\mathrm{Fe(I)}$ and nitrosyl as $\mathrm{NO}^{+}$
  2. magnetic moment of Fe is $3.87 \mathrm{~BM}$
  3. the colour is due to charge transfer
  4. all are correct statements

Solution

$\mathrm{NO} \longrightarrow \mathrm{NO}^{+}+\mathrm{e}^{-}$


Magnetic moment of $\mathrm{Fe}^{+}=\sqrt{15} \mathrm{~BM}$
$=3.87 \mathrm{~BM}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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