Q31. Yellow colour in NaCl is due to
(a) Schottky defect
(b) Metal excess defect due to anionic vacancies
(c) Frenkel defect
(d) Metal deficiency defect

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FirstInTest · Accepted Answer

Correct answer: b. In metal excess defect due to anion vacancies, negative ion is missing from its site by leaving a negative hole and this is occupied by electron. The anionic site occupied by electron is called F- centre. This imparts yellow colour to the NaCl while heating.

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