Question

Assertion (A): Schottky defect arises when a non-ionic solid is heated.
Reason (R): It happens because some of the lattice sites are vacant in the crystal.

Options:
(a) Both A and R are true and R is correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A is false and R is true
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Answer 1

Answer:

b

Explanation:

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Answer 2

(a) Both A and R are true and R is correct explanation of A

It refers to simple lattice vacancies, also known as valency defects, in elemental crystals. When oppositely charged ions leave their lattice positions and become integrated, for example near the surface, oppositely charged vacancies arise in ionic crystals.

Schottky Defect: This defect develops when oppositely charged ions depart their lattice location, leaving vacancies that allow the crystal to maintain its electrical neutrality. It's most common in highly ionic compounds with a minor difference in cation and anion size.

As a result, crystals with Schottky Defect have an equal number of cations and anions vacancies.