What is the number of $N$ atoms present in $EDTA$?

$A$ ligand is a

Which of the following is a negative ligand?

All ligands are .....

Which of the following complexes gives only $25\%$ mole of $AgCl$ precipitate when reacted with excess $AgNO_3$?

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: