For $K_3[Co(CN)_6]$,which of the following statements is not correct?

Which of the following is an outer orbital complex?

In a square planar complex of $Co^{2+}$ ion,the unpaired electron is present in which orbital?

Which of the following complexes exhibits $dsp^2$ hybridization?

Write the limitations of Valence Bond Theory $(VBT)$.

The number of isoelectronic species among $Sc^{3+}$, $Cr^{2+}$, $Mn^{3+}$, $Co^{3+}$, and $Fe^{3+}$ is $n$. If $n$ moles of $AgCl$ are formed during the reaction of the complex with the formula $CoCl_{3}(en)_{2}NH_{3}$ with excess $AgNO_{3}$, then the number of electrons present in the $t_{2g}$ orbital of the complex is . . . . . . .