8. in which of the following defects, the stoichiometry of the crystal is disturbed? a)Metal excess defect b)Impurity defect c)Schottky defect d)Both (1) & (2)

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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

A g^{+} << B r^{-}

Which of the following defects decrase the density ?

(a) Interstitial defect (b) Vacancy defect

Which of the following defects is also known as dislocation defect ?

(a) Frebkel defect (b) Schottky defect

(c)Non-stoichiometric defect (d)Simple interstitial defect

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