What are bidentate ligands? Give one example.

Classify the following complexes as homoleptic and heteroleptic:

$\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{SO}}_4, {\left[\mathrm{Cu}{\left(\mathrm{en}\right)}_2\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{Cl}\right]}^{+}, {\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\left(\mathrm{NCS}\right)\right]}^{2+}$ and tetraamminezinc($\mathrm{II}$) nitrate.

Write the formula of the following complex:

Potassium amminetrichloroplatinate($\mathrm{II}$)

Write the formula of the following complex:

Dicyanoaurate($\mathrm{I}$) ion