Chemistry - Redox Reactions Question with Solution | TestHub

The brown complex obtained in detection of nitrate radical is
$\left[\mathrm{F}\mathrm{e}\right({\mathrm{H}}_2\mathrm{O}{)}_5\mathrm{N}\mathrm{O}]\mathrm{S}{\mathrm{O}}_4$or$\left[\mathrm{F}\mathrm{e}\right({\mathrm{H}}_2\mathrm{O}{)}_5\mathrm{N}\mathrm{O}{]}^{2+}\mathrm{S}{\mathrm{O}}_4^{2-}$
The colour of the complex is due to charge transfer. This complex formally contains Fe (+1) and$\mathrm{N}{\mathrm{O}}^{+}$since Fe (II) gains one electron from NO which changes to$\mathrm{N}{\mathrm{O}}^{+}$.