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  4. The complex [ Fe ( H 2 O )5 NO ]2+ is formed in Brown ring test for nitrates select correct statement for the complex?

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Q. The complex $\left[ Fe \left( H _{2} O \right)_{5} NO \right]^{2+}$ is formed in Brown ring test for nitrates select correct statement for the complex?

The d-and f-Block Elements

Solution:

In $\left[ Fe \left( H _{2} O \right)_{5} NO \right]^{+2}$
$Fe ^{+}=3 d ^{6}\, 4 s ^{1}$
in presence of ligand $Fe ^{+}=3 d ^{7}\, 4 s ^{0}$
hybridisation $= sp ^{3} d ^{2}$
magnetic moment's $=3.87\, B . M$