JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Solid State

Which of the following compound is likely to show both Frenkel and Schottky defects in its crystalline form?

(A)CsCl
(B)AgBr✓ Correct
(C)ZnS
(D)KBr

Answer: (B)

Solution

A Frenkel defect appears when a small cation can slip into an interstitial site, while a Schottky defect appears when cation and anion are of comparable size and leave matched vacancies. In

AgBr

the small, polarisable

Ag X^{+}

can occupy interstitial positions, giving Frenkel defects, yet the ion sizes also allow matched vacancies, giving Schottky defects, so silver bromide shows both. The other salts, set by their size ratios, show only one kind.

JEE Main · 2020 · 08 Jan 2020 · Shift 2 · Single correct option

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