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

When $AgNO_3$ solution is added in excess to $1 \ M$ solution of $CoCl_3 \cdot X \ NH_3$,one mole of $AgCl$ is formed. What is the value of '$X$'?

Identify the anionic complex from the following.

Which among the following is $NOT$ a neutral ligand?

Explain the following term with an example: Bidentate ligands.

An excess of $AgNO_3$ is added to $100 \ mL$ of a $0.05 \ M$ solution of tetraaquadichloridochromium$(III)$ chloride. The number of moles of $AgCl$ precipitated will be . . . . . . $\times 10^{-3}$. (Nearest integer)