Schottky defect is observed in crystals when

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some cations move from their lattice site to interstitial sites

equal number of cations and anions are missing from the lattice

some lattice sites are occupied by electrons

some impurity is present in the lattice

answer is B.

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Detailed Solution

When equal number of cations and anions are missing from their lattice points, the defect is called Schottky defect.

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