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Metal Excess Defect

Schottky defe...

Question

Schottky defects are observed in solids with cations and anions of similar sizes. Which of the following compounds, therefore, is NOT likely to have a Schottky defect?

A

NaCl

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B

AgCl

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C

CsCl

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D

KCl

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Solution

The correct option is B AgCl
There is a considerable size difference between Ag cation and Cl anion. Hence a Frenkel defect is more likely to occur than a Schottky defect.

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Q. Statement 1: KCl is more likely to show schottky defect while Lil is more likely to show Frenkel defect.
Statement 2: Schottky defect is more likely in ionic solids in which cations and anions are of comparable size while Frenkel defect is more likely is which cations and anions have large differences in their ionic sizes.

K C l

is more likely to show the Schottky defect, while

L i

is more likely to show Frenkel defect. Reason: The schottky defect is found in those ionic solid which have cation and anion of similar size while Frenkel defect is more likely found in those solids which have the cation of smaller size.

Q. In Schottky defect,number of missing anions and cations in ionic solids are same.

Q. Assertion :Schottky defect is generally shown by the compounds with high co-ordination number. Reason: In Schottky defect, equal number of anions and cations are missing from their lattice sites.

Q. Schottky defect is not observed in which of the following solids?

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