Ambidentate ligands like `NO_(2)^(-) and SCN^(-)` are :

Options

A. unidentate
B. didentate
C. polydentate
D. has variable denticity

Answer

A

Explanation

Tetraamminequachloridocobalt (III) chloride is `[Co(NH_(3))_(4)(H_(2)O)Cl]Cl_(2)`.
Central atom - Cobalt(III)
Coordination sphere ligands -
Tetraammine - `4NH_(3)` groups neutral ligand
Aqua - `1H_(2)O` groups neutral ligand
Chlorido - 1 Cl group, negatively charged ligand, one negative charge
Counter ion Chloride ions 2.
Since Cobalt is 3 +, one valency is satisfied with Cl in coordination sphere and 2 by chlorine counter ions.
Hence, the formula of the coordination compound is `[CO(NH_(3))_(4)(H_(2)O)Cl]Cl_(2)`