Question

Schottky defect in crystals is observed when
(a) an ion leaves its normal site and occupies
an interstitial site
(b) unequal number of cations and anions are
missing from the lattice
(c) density of the crystal is increased
(d) equal number of cations and anions are
missing from the lattice

Answer 1

Answer:

b wala option............

Answer 2

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

Explanation:

Schottky defect in crystals is observed when equal number of cations and anions are missing from the lattice. It is a common defect in ionic compounds of high coordination number where both cations and anions are of similar size. Due to this, density of crystal decreases and begins to conduct electricity to a smaller extent. Example: KBr,NaCl, KCl.

Hence Option D is the answer.