Crystal field splitting energy $(CFSE)$ for $[CoCl_6]^{4-}$ is $18000 \ cm^{-1}$. The crystal field splitting energy $(CFSE)$ for $[CoCl_4]^{2-}$ will be (in $cm^{-1}$)

Among the following pairs of complexes,in which case is the $\Delta_0$ value higher for the first one?

$A$ strong field ligand gives a complex which is generally called:

Of the following complexes,the one with the largest value of crystal field splitting energy is

Given below are two statements:
Statement $I$: Among $Zn$,$Mn$,$Sc$ and $Cu$,the energy required to remove the third valence electron is highest for $Zn$ and lowest for $Sc$.
Statement $II$: The correct order of the following complexes in terms of $CFSE$ is $[Co(H_2O)_6]^{2+} < [Co(H_2O)_6]^{3+} < [Co(en)_3]^{3+}$.

In which of the following coordination entities the magnitude of $\Delta_o$ ($CFSE$ in octahedral field) will be maximum? (Atomic Number of $Co = 27$)