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How are the properties of crystals affected by Schottky and Frenkel defects? Density

Important Questions on Solid State

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

The correct statement regarding defects in crystalline solids is :

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

{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>Imperfection in Solids

Experimentally it was found that a metal oxide has formula

M_{0.98} O

. Metal M, is present as

M^{2 +}

and

M^{3 +}

in its oxide. Fraction of the metal which exists as

M^{3 +}

would be:

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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>Imperfection in Solids

ZnO

turns yellow on heating. Why?

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Which of the following statements is true?

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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>Imperfection in Solids

1

mole of

NaCl

is doped with

10^{- 5}

mole of

{SrCl}_{2}

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

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Schottky defect in crystals is observed when:

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Schottky defect in a crystal arises due to

HARD

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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}]

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

The correct statement among the following, regarding defects in solids is

1

) Frenkel defect is favored by small difference in the sizes of cation and anion.

2

) Frenkel defect is a metal excess defect.

3

) Trapping of electron in the lattice leads to formation of F-centres.

4

) Schottky defect has no effect on the physical property of solids.

HARD

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

What type of stoichiometric defect is shown by

ZnS

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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

MEDIUM

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Experimentally it was found that a metal oxide has formula

M_{0.98} O .

Metal

M

is present as

M^{2 +}

adn

M^{3 +}

in its oxide. Fraction of the metal which exists as

M^{3 +}

would be :

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Schottky defect is shown by

EASY

Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

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

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Chemistry>Physical Chemistry>Solid State>Imperfection in Solids

Which is the incorrect statement?

How are the properties of crystals affected by Schottky and Frenkel defects? Density

Important Questions on Solid State

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