Tag: imperfections in solids

Question 1

(i) Frenkel defect create a vacancy defect at its original site and an interstitial defect at its new position.
(ii) Frenkel defect is stoichiometric point defect.
(iii) Frenkel defect is also called dislocation defect.
(iv) Silver halide shows Frenkel defect
Select the correct statements :

imperfections in solids solid state the solid state chemistry

$(ii),(iii),(iv)$ only
$(i),(ii),(iii)$ only
$(i),(ii),(iii),(iv)$
$(i),(ii),(iv)$ only

Answer

Correct Option: C

Question 2

$NaCl$ shows Schottky defects and $AgCl$ Frenkel defects. Their electrical conductivity is due to ________.

imperfections in solids solid state the solid state chemistry

motion of ions and not the motion of electrons
notion of electrons and not the motion of ions
lower coordination number of $NaCl$
higher coordination number of $AgCl$

Answer

Correct Option: A

Question 3

Metallic or non-stoichiometric (or interstitial) hydrides are formed by:

imperfections in solids solid state the solid state chemistry

Many d-block and f-block elements.
Many s-block elements
Many p-block elements
None of these

Answer

Correct Option: A

Question 4

Calculate the dencity of NaCl type ionic solid AB($M _{w}$=60) in $gm/CM^{3}$ if shortest distance between two nearest neighbours is 100 pm &solid having $20\%$ schottky defect$(N _{A}=6\times10^{23}$)

imperfections in solids solid state the solid state chemistry

10
20
30
40

Answer

Correct Option: C

Question 5

When NaCl is doped with ${ 10 }^{ -3 }$ mole % of Sr${ Cl } _{ 2 }$, what is the number of cationic vacancies?

imperfections in solids solid state the solid state chemistry

${ 10 }^{ -5 }\times { N } _{ A }$
${ 10 }^{ -7 }\times { N } _{ A }$
6.022$\times{ 10 }^{8 }{ N } _{ A }$
None of these

Answer

Correct Option: C

Question 6

The composition of a sample of iron oxide is $Fe _{0.93}O _{1.0}$. What percentage of iron is present in the form of Fe(III)?

imperfections in solids solid state the solid state chemistry

$5.053$
$10.053$
$15.053$
None of the above

Answer

Correct Option: C

Question 7

The defect observed in solid substances having low coordination number is

imperfections in solids solid state the solid state chemistry

Schottky
Frenkel
Vacancy
All of these

Answer

Correct Option: A

Question 8

If $100$ moles of NaCI are doped with ${10^{ - 3}}$ moles of $Sr{C _2}$ what is the concentration of cation vacancies?

imperfections in solids solid state the solid state chemistry

$6.02 \times {10^{18}}mo{l^{ - 1}}$
$12.04 \times {10^{18}}mo{l^{ - 1}}$
$3.01 \times {10^{18}}mo{l^{ - 1}}$
$12.04 \times {10^{20}}mo{l^{ - 1}}$

Answer

Correct Option: A

Question 9

According to recent studies which of the following interstitial hydrides have simi-lattices that of their parent metals

imperfections in solids solid state the solid state chemistry

$La, Yb, W$
$Yb, W, V$
$V, I, a$
$N, Pd, Ce, Ac$

Answer

Correct Option: A

Question 10

Which of the following is an interstitial compound?

imperfections in solids solid state the solid state chemistry

$ PdCl _2 $
$ NH _3 $
$ZnO$
$TiH$

Answer

Correct Option: D

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