Which of the following is a chelating ligand?

The volume (in $mL$) of $0.1 \, M \, AgNO_3$ required for complete precipitation of chloride ions present in $20 \, mL$ of $0.01 \, M$ solution of $[Cr(H_2O)_5Cl]Cl_2$ as silver chloride is $..........$.

The molecular formula of a coordination complex is $CoH_{12}O_6Cl_3$. When one mole of this aqueous solution of the complex is reacted with an excess of aqueous $AgNO_3$ solution,$3$ moles of $AgCl$ are formed. What is the correct formula of the complex?

The number of neutral molecules or negative groups attached to the central metal atom in a complex ion is called:

Which of the following complexes contains an anionic ligand?

What is the value of the primary valence of $Co$ in $CoCl_{3}$?