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Explain the terms a. Optical activity b. Ligand c. Interstitial compounds |
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Answer» a. Optical activity (Chirality): The property of a substance to rotate the plane of a plane polarised light towards the right (clockwise) or towards the left (anticlockwise) is called optical activity. eg. Lactic acid, glucose, cane sugar, 2-chlorobutane, etc., shows optical activity. b. The molecules or ions which are coordinated to the central atom or ion in the coordination compound are called ligands or donor groups. eg. 1. In [Ni(NH3)6]2+, central metal ion is Ni2+ and ligands are NH3 molecules. 2. In [Cr(H2O)6]3+, the central metal ion is Cr3+ and the ligands are H2O molecules. c. 1. Interstitial compounds are those which are formed when small atoms like H, C, N, B, etc., are trapped inside the crystal lattice of metals. 2. Interstitial compounds have variable composition and are non-stoichiometric in nature. eg. TiC, TiH1.73, Mn4N, Fe3H, VH0.56, ZrH1.92, etc. |
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