Which of the following defect produces F-centres ?

Metal excess defect

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Scottky defect

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Metal deficiency defect

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Vacancy defect

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Solution

The correct option is A Metal excess defect
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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Similar questions

A g B r_{(s)}

Which of the following point defects are shown by AgBr(s) crystals ?

1. Schottky defect

2. Frenkel defect

3. Metal excess defect

4. Metal deficiency defect

(a) 1 and 2 (b) 3 and 4 (c) 1 and 3 (d) 2 and 4

In metal deficiency defect

Metal Deficiency Defect is observed due to:

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