c
The cobalt ion in \(\left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3}\) undergoes \(d s^{2} p^{3}\) hybridization to form inner orbital or low spin or spin paired complex.

6 electrons are present in \(t_{2 g}\) level and 0 electrons are present in \(e_{g}\) level.

The crystal field stabilization energy of \(\left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3}\) is \(CFSE =6 \times\left(-0.4 \Delta_{0}\right)+0 \times\left(0.6 \Delta_{0}\right)=\)

\(-2.4 \Delta_{0}\)