EASY

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Which of the following statements regarding Frenkel defects is FALSE?

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Important Questions on Solid State

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

EASY

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

Schottky defect is shown by

MEDIUM

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

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.

EASY

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

Which of the following statements is true?

EASY

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

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

EASY

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

Schottky defect in crystals is observed when:

EASY

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

In a solid lattice, the cation has left a lattice site and is located at an interstitial position The lattice defect is

MEDIUM

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

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:

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?

MEDIUM

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

EASY

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

Which is the incorrect statement?

EASY

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

The correct statement regarding defects in solid is

MEDIUM

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

MEDIUM

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:

EASY

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

Schottky defect in crystals is observed when

MEDIUM

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

Among the following solids, Schottky defect is NOT observed in-

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:

MEDIUM

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

Schottky defect in a crystal arises due to

EASY

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

The correct statement regarding defects in crystalline solids is :

Which of the following statements regarding Frenkel defects is FALSE?

Important Questions on Solid State

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