The color of $CoCl_3 \cdot 5NH_3 \cdot H_2O$ is ....

What is the number of moles of ionisable $Cl^{-}$ ions in a coordination complex if it forms $2 \ moles$ of $AgCl$ when treated with silver nitrate solution in excess?

Which among the following is a neutral complex?

In the coordination complex, $Potassium \ hexacyanoferrate(II)$, the central metal ion acts as:

What is the number of moles of donor atoms present in one mole of oxalate ion?

Which of the following is a chelating ligand?