' X ' is the number of electrons in \({t}_{2g}\) orbitals of the most stable complex ion among \({\left[\mathrm{Fe}{\lef…

' X ' is the number of electrons in \({t}_{2g}\) orbitals of the most stable complex ion among \({\left[\mathrm{Fe}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}\), \({\left[\mathrm{Fe}\left({\mathrm{Cl}}_{6}\right)\right]}^{3-}\), \({\left[\mathrm{Fe}{\left({\mathrm{C}}_{2}{\mathrm{O}}_{4}\right)}_{3}\right]}^{3-}\) and \({\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{6}\right]}^{3+}\). The nature of oxide of vanadium of the type \({\mathrm{V}}_{2}{\mathrm{O}}_{\mathrm{x}}\) is:

[JEE Main 2025, 4 Apr (Shift 2)]