Why LiCl acquires pink colour when heated in Li vapours?!?
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When LiCl is heated in presence of Li vapours, there is deposition of Li atoms on surface of the crystal. The Cl⁻ ions diffuse to surface crystal to form LiCl by combining with Li⁺ ions. The released electrons diffuse into crystal and occupy anionic sites. The crystal becomes excess of Li as a result and this defect is called METAL EXCESS DEFECT DUE TO ANIONIC VACANCY. The anionic sites occupied by unpaired electrons are called F-centres, they impart pink colour to crystal.
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Answer:
due to formation of f centres
Explanation:
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