If an electron is present in place of anion in a crystal lattice, then it is called

Frenkel defect

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Schottky defect

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Interstitial defects

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F-centre

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Solution

The correct option is D F-centre
When electrons are trapped in anion vacancies, these are called F-centres.

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Similar questions

In an imperfect crystal , both cation and anion have left the lattice. The cystal defect is known as

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

The defect when an ion leaves its lattice point and occupies an interstitial position in the crystal lattice is called ------------------

	Statements	Score
a.	In an antifluorite structure, cations are present in all tetrahedral voids.	$1$
b.	If the radius of cation is $0.35$ pm and that of anion is $0.95$ pm, then the co-ordination number of the crystal is $4$ .	$2$
c.	An atom or ion is transfered from a lattice site to an interstitial position in Frenkel defect.	$3$
d.	The density of a crystal always decreases in point defects.	$4$

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