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14. Why LiCI acquires pink colour when heated in Li vapours?

Answer»

The Cl- ions diffuse to the surface and form LiCl with {Li}^{+} ions. An electron is released which diffuses into the crystal and occupies the anionic site. Such anionic sites occupied with electrons are called F-centres. These impart pink colour to the crystal. The colour results by the excitation of the electrons on absorbsing energy from visible light falling on the crystals



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