The complex ${\left[\text{Fe}{\left({\text{H}}_2\text{O}\right)}_5\text{NO}\right]}^{2+}$ is formed in the brown ring test for nitrates when freshly prepared ${\mathrm{FeSO}}_4$ solution is added to aqueous solution of ${\text{NO}}_3^{-}$ followed by addition of conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$. Select correct statement about this complex

A blue colour complex is obtained in the analysis of ${\mathrm{Fe}}^{+3}$ having formula ${\mathrm{Fe}}_4{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}_3$.

Let $\mathrm{a}=$oxidation number of iron in the coordination sphere, $\mathrm{b}=$ no. of secondary valencies of central iron ion. $\mathrm{c}=$ Effective atomic number of iron in the coordination sphere.

Then find the value of $(\mathrm{c}+\mathrm{a}-2\mathrm{b}).$

Total number of paramagnetic complexes which are inner orbital complexes:

$\left(\mathrm{i}\right) \left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$

$\left(\mathrm{ii}\right) \left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\left({\mathrm{NO}}_3\right)}_2$

$\left(\mathrm{iii}\right) \left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{SO}}_4$

$\left(\mathrm{iv}\right) {\mathrm{K}}_2\left[{\mathrm{PtCl}}_6\right],$

$\left(\mathrm{v}\right) \left[\mathrm{V}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{SO}}_4$

$\left(\mathrm{vi}\right) \left[\mathrm{Mn}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{SO}}_4$

$\left(\mathrm{vii}\right) \left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\left(\mathrm{NO}\right)\right]{\mathrm{SO}}_4$

$\left(\mathrm{viii}\right) {\mathrm{K}}_3\left[{\mathrm{CuCl}}_4\right]$

$\left(\mathrm{ix}\right) {\mathrm{Na}}_4\left[\mathrm{Fe}\left(\mathrm{CN}{)}_5\right(\mathrm{NOS})\right]$