If $\Delta_{0} < P$,then what is the electronic arrangement of the metal atom/ion in a complex with $d^4$ configuration?

$CN^{-}$ ligand containing complexes are generally ...... .

The order of energy absorbed, which is responsible for the color of the following complexes, is:
$A: [Ni(H_{2}O)_{2}(en)_{2}]^{2+}$
$B: [Ni(H_{2}O)_{4}(en)]^{2+}$
$C: [Ni(en)_{3}]^{2+}$

What is the correct order of increasing field strength for the ligands $NH_3$,$en$,$CN^-$,and $CO$?

In the complex ion $ML_6^{n+}$,$M^{n+}$ has five $d$-electrons and $L$ is a weak field ligand. According to crystal field theory,the magnetic property of the complex ion is due to how many unpaired electrons?

Match the electronic configurations in List-$I$ with appropriate metal complex ions in List-$II$ and choose the correct option.
[Atomic Number: $Fe=26, Mn=25, Co=27$]

List-$I$	List-$II$
$P$. $t_{2g}^6 e_g^0$	$1$. $[Fe(H_2O)_6]^{2+}$
$Q$. $t_{2g}^3 e_g^2$	$2$. $[Mn(H_2O)_6]^{2+}$
$R$. $e^2 t_2^3$	$3$. $[Co(NH_3)_6]^{3+}$
$S$. $t_{2g}^4 e_g^2$	$4$. $[FeCl_4]^{-}$
	$5$. $[CoCl_4]^{2-}$