Sarthaks Test
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Schottky defect is observed in crystals when __________.

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

(ii) equal number of cations and anions are missing from the lattice.

(iii) some lattice sites are occupied by electrons.

(iv) some impurity is present in the lattice.

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(ii) equal number of cations and anions are missing from the lattice.

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