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Coordination Compounds

Long Answer Type

191.

What is meant by stability of coordinate compound in solution? State the factors which govern stability of complexes.

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Short Answer Type

192. What is meant by the chelate effect? Give an example.

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193. Discuss briefly the role of coordination compounds in biological systems.

Biological system:

(i) Haemoglobin the red blood cell which acts as oxygen carrier to different parts of the body is a complex of iron(II).

(ii) Vitamin B₁₂ is a complex of cobalt metal. Trace metals also function through coordination processes.

(iii) A complex of zinc(II) called enzyme CPA helps in digestion of food.

(iv) The chlorophyll, the green colouring plant pigment that plays an important role in photosynthesis is a complex of magnesium. In chlorophyll Mg is coordinated to four nitrogens of porphyin units.

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