How many of the following are ambidentate ligands?
i. $\mathrm{CO}$
ii. $\mathrm{CN}$
iii. $\mathrm{F}$
iv. ${\mathrm{OH}}^{-}$
v. ${\mathrm{SCN}}^{-}$
vi. ${\mathrm{NO}}_2^{-}$
vii. ${\mathrm{CH}}_3{\mathrm{NH}}_2$
viii. ${\mathrm{H}}_2\mathrm{N}{\left({\mathrm{CH}}_2\right)}_2{\mathrm{NH}}_2$

The total number of coordination sites in ethylenediaminetetraacetate ( ${\mathrm{EDTA}}^{4-}$) is ...................

Explain the term Ligand.