Which of the following complexes contains an ambidentate ligand?

Identify the neutral ligand from the following.

What is the coordination number of cobalt in $[Co(NH_3)_4Cl_2]Cl$?

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 $..........$.

An octahedral complex with the formula $CoCl_3 \cdot nNH_3$ upon reaction with excess of $AgNO_3$ solution gives $2$ moles of $AgCl$. Consider the oxidation state of $Co$ in the complex is '$x$'. The value of $x+n$ is . . . . .

Identify the heteroleptic complex from the following.