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What is Frenkel defect? What is its effect on the density of a solid?

Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

The correct statement regarding defects in crystalline solids is :

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

What is Frenkel defect? how does it affect density of the solid?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

A metal exists as an oxide with formula

M_{0.96} O

Metal

M

can exist as

M^{+ 2}

and

M^{+ 3}

in its oxide

M_{0.96} O

. The percentage of

M^{+ 3}

in the oxide is, nearly

HARD

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

KBr

is doped with

10^{- 5}

mole percent of

{SrBr}_{2}

The number of cationic vacancies in

1 g

KBr

crystal is

10^{14}

. (Round off to the Nearest Integer). [Atomic Mass :

K = 39.1 u, Br = 79.9 u

N_{A} = 6.023 \times 10^{23}]

EASY

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

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

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Schottky defect in crystals is observed when:

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Which one of the following compounds shows both, Frenkel as well as Schottky defects?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Out of $NaCl$ and $AgCl$ , which one shows Frenkel defect and why?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

1

mole of

NaCl

is doped with

10^{- 5}

mole of

{SrCl}_{2}

. The number of cationic vacancies in the crystal lattice will be:

EASY

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Schottky defect is shown by

HARD

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

What type of stoichiometric defect is shown by

ZnS

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Schottky defect in a crystal arises due to

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

A type of defect observed in stoichiometric compounds is Schottky defect. Schottky defect occur mainly in ionic compounds where

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

{LiCoO}_{2}

crystallizes in a rhombohedral structure. Consider a situation where

50 %

lithium

(Li)

is extracted from the lattice. To keep the crystal electrically neutral. change in average oxidation state of

Co

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Given below are two statements:
Statement I : Frenkel defects are vacancy as well as interstitial defects.
Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres.

Choose the most appropriate answer for the statements from the options given below:

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

State whether true of false : In Schottky defect, in order to maintain electro-neutrality, the number of missing cations and anions are equal.

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Why is Frenkel defect not found in pure alkali metal halides?

HARD

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

ZnO

turns yellow on heating. Why?

EASY

Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Which type of 'defect' has the presence of cations in the interstitial sites?

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Chemistry>Physical Chemistry>Solid State>Defects in Crystal Structure

Which is the incorrect statement?

What is Frenkel defect? What is its effect on the density of a solid?

Important Questions on Solid State

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