$A$ ligand is a

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

Explain the bonding in coordination compounds in terms of Werner's postulates.

On treating $100 \ mL$ of $0.1 \ M$ aqueous solution of the complex $CrCl_3 \cdot 6 H_2 O$ with excess of $AgNO_3$,$2.86 \ g$ of $AgCl$ was obtained. The complex is:

Which coordination compound from the following has a net negative charge on the complex ion?

The number of precipitable halide ions in the sample $[Pt(NH_3)Cl_2Br]Cl$ will be