Coordination Compounds

Secondary valences of the following complexes based on their reactions with excess $\mathrm{AgNO}_3$ are

$$ \begin{array}{llc} \hline & \begin{array}{l} \text { Formula of the } \\ \text { complexes } \end{array} & \begin{array}{c} \text { Moles of } \mathrm{AgCl} \text { precipitated } \\ \text { per mole of complex } \end{array} \\ \hline \text { (I) } & \mathrm{CoCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O} & 3 \\ \hline \text { (II) } & \mathrm{NiCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O} & 2 \\ \hline \text { (III) } & \mathrm{Co}\left(\mathrm{SO}_4\right) \mathrm{Br} \cdot 5 \mathrm{NH}_3 & 1 \\ \hline \end{array} $$