(a). On the basis of application of coordination compounds :
- In biological system – Haemoglobin, Vitamin B12, Chlorophyll.
- Estimation of hardness of water – EDTA.
- Extraction of metals – Ni(CO)4
- n medicine – D-penicillamine, cis-platin
(b). The coordination compounds are :
1. K3[Fe(C2O4)3] – Potassiumtrioxalatoferrate(III)
2. [Cr(CN)3]3+ – Trisethylenediaminechromium(III) ion
3. [CoSO4(NH3)4]NO3 – Tetraamminesulphato- cobalt(III) nitrate
4. [CO(NO2)3 (NH3)3] – Triamminetrinitrito-N-cobalt(III)