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Byju's Answer
Standard XII
Chemistry
Schottky Defect
Schottky defe...
Question

Schottky defect in a crystal arises due to:

A
Creation of equal number of cation and anion vacancies
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B
Creation of unequal number of cation and anion vacancies
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C
Migration of cations to interstitial voids
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D
Migration of anions to interstitial voids
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Solution

The correct option is A Creation of equal number of cation and anion vacancies
Schottky defects arises when equal number of cation and anion both leave the crystal, leaving equal number of cation and anion vacancies.

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Q.

Schottky defect is observed in crystals when .....................

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

(b) equal number of cation and anions are missing from the lattice

(c) some lattice sites are occupied by electrons

(d) some impurity is present in the lattice

Q. Assertion :Large number of Schottky defects lead to lowering in density of crystal lattice. Reason: The defect is due to missing cation and anion. Equal numbers of cations and anions are missing to maintain electroneutrality.

Read the above assertion and reason and choose the correct statement regarding it.


Q. Give the correct order of initials T (true) or F (false) for following statements:
I. In an anti-fluorite structure, anions form FCC lattice and cations occupy all tetrahedral voids.
II. If the radius of cations and anions are 0.2 Ao and 0.95 Ao respectively, then coordination number of cation in the crystal is 4.
III An atom/ion is transferred from a lattice site to an interstitial position in Frenkel defect.
IV. Density of crystal always increases due to substitutional impurity defect.
Q. In Schottky defect,number of missing anions and cations in ionic solids are same.
Q. Give the correct order of initials T (true) or F (False) for following statements:
I. In an anti-fluorite structure, anions form FCC lattice and cations occupy all tetrahedral voids.
II. If the radius of cations and anions are 0.2 ˚A and 0.95 ˚A, then co-ordination number of cation in the crystal is 4.
III. An ion is transferred from a lattice site to an interstitial position in Frenkel defect.
IV. Density of crystal always increases due to substitutional impurity defect.
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