Impurity defect is the defect in which

Both cations and anions miss from their lattice sites creating voids.

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Ions are replaced by different elements ions.

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Anions occupy interstitial voids.

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electrons occupy interstitial voids.

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Solution

The correct option is B
Ions are replaced by different elements ions.

Impurity defect diagram.

In impurity defect as you see in diagram, the sodium ion is replaced by Strontium ion and balance the charge an anion miss from its lattice point.As the ion of one element is replaced by ion of other element, it is called impurity defect.

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Similar questions

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

0.2

A^{o}

0.95

A^{o}

4

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

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