What is the hybridization of$\mathrm{Fe}$ in sodium thio nitroprusside. 

$$\begin{gathered} N{a}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_5\mathrm{NOS}\right] \\ {\mathrm{Fe}}^{+2}-{\mathrm{d}}^6\mathrm{sys} \end{gathered}$$

In [Fe(CN)₅NO] the oxidation state of Fe is +2, NO+ is the ligand and it has d²sp³-hybridization.