The pink colour of lithium chloride crystal is due to the

By Team Aakash Byju's | 30th October 2022 Frenkel defect Metal excess defect Metal deficiency defect Impurity defect

Brief explanation

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Due to anion vacancies, LiCl possesses a non-stoichiometric metal excess defect.

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Cl- ions diffuse to the crystal surface of a heated LiCl crystal and combine with the lithium atom to create Li+ and Cl- ions.

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Electrons emitted by reacted lithium atoms occupy the vacant sites of chloride ions that had moved to the surface to react with Li.

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The anionic sites filled by unpaired electrons are F-centres, which give LiCl crystals a pink colour.

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The colour is caused as a result of the excitation of these electrons when they absorb energy from visible light falling on crystals.

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The pink colour of lithium chloride crystal is due to the

Chemistry

A

C

B

D