(B) $Schottky$ defect is a type of point defect in ionic crystals where an equal number of cations and anions are missing from their lattice sites to

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Equal number of cations and anions are missing from the lattice.

(B) $Schottky$ defect is a type of point defect in ionic crystals where an equal number of cations and anions are missing from their lattice sites to maintain electrical neutrality.This results in a decrease in the density of the crystal.Therefore,the correct statement is that an equal number of cations and anions are missing.

Class 12 Chemistry Solid State Defects in crystal

Easy

In $Schottky$ defect,.....

A
Cations leave their lattice sites and occupy interstitial sites.
B
Equal number of cations and anions are missing from the lattice.
C
Anions are missing and electrons are present in their place.
D
Equal number of extra cations and electrons are present in the interstitial sites.