$f - c e n t r e$ is

Anion vacancy occupied by unpaired electron

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Anion vacancy occupied by electron

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Cation vacancy occupied by electron

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Anion present in interstitial site

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Solution

The correct option is A Anion vacancy occupied by unpaired electron
$F - c e n t e r$ is unpaired $e^{-}$ .

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Similar questions

An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................

(a) some of the anionic sites are occupied by an unpaired electron

(b) some of the anionic sites are occupied by a pair of electrons

(d) F-centres are created which impart colors to the crystals

Cations are present in the interstitial sites in ...........

(a) Frenkel defect (b) Schottky defect

If NaCl is doped with $10^{- 3} m o l %$ of $S r C l_{2^{'}},$ each $S r^{2 +}$ ion replaces two $N a^{+}$ ions, but occupies only one lattice point in place of $N a^{+}$ ion. This creates one cation vacancy.

Which of the following defects decrase the density ?

(a) Interstitial defect (b) Vacancy defect

Schottky defect is observed in crystals when .....................

(a) some cations move from their lattice site to interstitial sites

(b) equal number of cation and anions are missing from the lattice

(d) some impurity is present in the lattice

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f−centre is

The correct option is A Anion vacancy occupied by unpaired electronF−center is unpaired e−.

$f - c e n t r e$ is

The correct option is A Anion vacancy occupied by unpaired electron
$F - c e n t e r$ is unpaired $e^{-}$ .