According to crystal field theory,the $M-L$ bond in a complex is

Carbon donor ligands are strong ligands and usually form low spin complexes. Among the complexes given below,select the high spin complex.

Absorbed colour of the solutions of the following complexes $[M(NH_3)_6]^{2+}$,$[M(H_2O)_6]^{2+}$ and $[MCl_4]^{2-}$ are respectively (having the same metal ion):

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

The number of unpaired $d$-electrons in $[Co(H_2O)_6]^{3+}$ is $\qquad$

Write the correct order of wavelength of absorption in the visible region for the following complexes: