In $K_4[Ni(C_2O_4)_3]$,what is the sum of the coordination number and the oxidation number of $Ni$?

Which of the following complex compounds does not react with $AgNO_3$ to form a precipitate of $AgCl$?

Three moles of $AgCl$ get precipitated when one mole of an octahedral coordination compound with empirical formula $CrCl_{3} \cdot 3NH_{3} \cdot 3H_{2}O$ reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is $......$

An excess of $AgNO_3$ is added to $100 \ mL$ of a $0.01 \ M$ solution of dichlorotetraaqua-chromium$(III)$ chloride. The number of moles of $AgCl$ precipitated would be

Determine the primary and secondary valency for $K_4[Fe(CN)_6]$.

Write a note on ambidentate ligands.