In which of the following complexes will the $CFSE$ (Crystal Field Stabilization Energy),$\Delta_0$ be equal to zero?

The correct order of ligands in the spectrochemical series is

Which complex shows the highest crystal field stabilisation energy?

$[Fe(CN)_6]^{4-}$ and $[Fe(H_2O)_6]^{2+}$ show different colours in dilute solution because

Consider the metal complexes $[Ni(en)_3]^{2+}$ $(A)$, $[NiCl_4]^{2-}$ $(B)$ and $[Ni(NH_3)_6]^{2+}$ $(C)$. Choose the $\text{CORRECT}$ option by considering the number of unpaired electrons present in $(A)$, $(B)$ and $(C)$ respectively and the order of frequency of absorption.

Which of the following order of $CFSE$ is incorrect?