The ligand in potassium ferricyanide is

The neutral ligand is

Which of the following is a negatively charged bidentate ligand?

State the rules to write the formulas of mononuclear coordination entities.

The coordination number and the oxidation state of the element $M$ in the complex $[M(en)_{2}(C_{2}O_{4})]NO_{2}$ [where $en$ is ethane-$1,2$-diamine] are respectively:

$A$ ligand which has two different donor atoms and either of the two ligates with the central metal atom/ion in the complex is called $\qquad$