NEET > Solid State

Explore popular questions from Solid State for NEET. This collection covers Solid State previous year NEET questions hand picked by popular teachers.


Q 1.    

Correct4

Incorrect-1

Which is the incorrect statement?

A

Density decreases in case of crystals with Schottky defect.

B

{tex}NaCl_{(s)}{/tex} is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal.

C

Frenkel defect is not favoured in those ionic compounds in which sizes of cation and anions are almost equal.

{tex} {Fe} \mathrm { O } _ { 0.98 } {/tex} has non-stoichiometric metal deficiency defect.

Explanation

Q 2.    

Correct4

Incorrect-1

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion {tex} \left( \mathrm { Ca } ^ { 2+ } \right) {/tex} and fluoride ion {tex} \left( \mathrm { F } ^ { - } \right) {/tex} are

A

4 and 2

B

6 and 6

8 and 4

D

4 and 8

Explanation

Q 3.    

Correct4

Incorrect-1

Lithium has a {tex}bcc{/tex} structure. Its density is 530{tex} \mathrm { kg } \mathrm { m } ^ { - 3 } {/tex} and its atomic mass is 6.94{tex} \mathrm { g } \mathrm { mol } ^ { - 1 } {/tex} . Calculate the edge length of a unit cell of lithium metal. {tex} \left( N _ { A } = 6.02 \times 10 ^ { 23 } \mathrm { mol } ^ { - 1 } \right) {/tex}

A

527{tex} \mathrm { pm } {/tex}

B

264{tex} \mathrm { pm } {/tex}

C

154{tex} \mathrm { pm } {/tex}

352{tex} \mathrm { pm } {/tex}

Explanation

Q 4.    

Correct4

Incorrect-1

The ionic radii of {tex} A ^ { + } {/tex} and {tex} B^- {/tex} ions are {tex} 0.98 \times 10 ^ { - 10 } \mathrm { m } {/tex} and {tex} 1.81 \times 10 ^ { - 10 } \mathrm { m } {/tex} . The coordination number of each ion in {tex} A B {/tex} is.

A

8

B

2

6

D

4

Explanation

Q 5.    

Correct4

Incorrect-1

The vacant space in {tex} b c c {/tex} lattice unit cell is

A

48{tex} \% {/tex}

B

23{tex} \% {/tex}

32{tex} \% {/tex}

D

26{tex} \% {/tex}

Explanation

Q 6.    

Correct4

Incorrect-1

The correct statement regarding defects in crystalline solids is

A

Frenkel defects decrease the density of crystalline solids

Frenkel defect is a dislocation defect

C

Frenkel defect is found in halides of alkaline metals

D

Schottky defects have no effect on the density of crystalline solids.

Explanation

Q 7.    

Correct4

Incorrect-1

A given metal crystallises out with a cubic structure having edge length of 361{tex} \mathrm { pm } {/tex} . If there are four metal atoms in one unit cell, what is the radius of one atom?

A

80{tex} \mathrm { pm } {/tex}

B

108{tex} \mathrm { pm } {/tex}

C

40{tex} \mathrm { pm } {/tex}

127{tex} \mathrm { pm } {/tex}

Explanation

Q 8.    

Correct4

Incorrect-1

If {tex} a {/tex} is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be

A

{tex} \frac { 2 } { \sqrt { 3 } } a {/tex}

B

{tex} \frac { 4 } { \sqrt { 3 } } a {/tex}

C

{tex} \frac { \sqrt { 3 } } { 4 } a {/tex}

{tex} \frac { \sqrt { 3 } } { 2 } a {/tex}

Explanation

Q 9.    

Correct4

Incorrect-1

A metal has a {tex}fcc{/tex} lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72{tex} \mathrm { g } \mathrm { cm } ^ { - 3 }{/tex}.The molar mass of the metal is {tex} \left( N _ { A } \text { Avogadro's constant } = 6.02 \times 10 ^ { 23 } \mathrm { mol } ^ { - 1 } \right) {/tex}

27{tex} \mathrm { g } \mathrm { mol } ^ { - 1 } {/tex}

B

20{tex} \mathrm { g } \mathrm { mol } ^ { - 1 } {/tex}

C

40{tex} \mathrm { g } \mathrm { mol } ^ { - 1 } {/tex}

D

30{tex} \mathrm { g } \mathrm { mol } ^ { - 1 } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

The number of carbon atoms per unit cell of diamond unit cell is

A

6

B

1

C

4

8

Explanation

Q 11.    

Correct4

Incorrect-1

A metal crystallises with a face-centred cubic lattice. The edge of the unit cell is 408{tex}\mathrm{ pm }{/tex}.The diameter of the metal atom is

288{tex} \mathrm { pm } {/tex}

B

408{tex} \mathrm { pm } {/tex}

C

144{tex} \mathrm { pm } {/tex}

D

204{tex} \mathrm { pm } {/tex}

Explanation

Q 12.    

Correct4

Incorrect-1

The number of octahedral void(s) per atom present in a cubic close-packed structure is

1

B

3

C

2

D

4

Explanation

Q 13.    

Correct4

Incorrect-1

Structure of a mixed oxide is cubic close packed {tex}(ccp){/tex}. The cubic unit cell of mixed oxide ions is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

A

{tex} A B O _ { 2 } {/tex}

B

{tex} A _ { 2 } B O _ { 2 } {/tex}

C

{tex} A _ { 2 } B _ { 3 } \mathrm { O } _ { 4 } {/tex}

{tex} A B _ { 2 } \mathrm { O } _ { 2 } {/tex}

Explanation

Q 14.    

Correct4

Incorrect-1

A solid compound {tex} X Y {/tex} has {tex} \mathrm { NaCl } {/tex} structure. If the radius of the cation is {tex} 100 \mathrm { pm } , {/tex} the radius of the anion {tex} \left( Y ^ { - } \right) {/tex} will be

A

275.1{tex} \mathrm { pm } {/tex}

B

322.5{tex} \mathrm { pm } {/tex}

241.5{tex} \mathrm { pm } {/tex}

D

165.7{tex} \mathrm { pm } {/tex}

Explanation

Q 15.    

Correct4

Incorrect-1

{tex} A B {/tex} crystallizes in a body centred cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is

335{tex} \mathrm { pm } {/tex}

B

250{tex} \mathrm { pm } {/tex}

C

200{tex} \mathrm { pm } {/tex}

D

300{tex} \mathrm { pm } {/tex}

Explanation

Q 16.    

Correct4

Incorrect-1

Lithium metal crystallises in a body-centred cubic crystal. If the length of the side of the unit cell of lithium is 351{tex} \mathrm { pm } {/tex} , the atomic radius of lithium will be

151.8{tex} \mathrm { pm } {/tex}

B

75.5{tex} \mathrm { pm } {/tex}

C

300.5{tex} \mathrm { pm } {/tex}

D

240.8{tex} \mathrm { pm } {/tex}

Explanation

Q 17.    

Correct4

Incorrect-1

Copper crystallises in a face-centred cubic lattice with a unit cell length of 361{tex} \mathrm { pm } {/tex} . What is the radius of copper atom in {tex} \mathrm { pm } {/tex} ?

A

157

B

181

C

108

128

Explanation

Q 18.    

Correct4

Incorrect-1

Percentage of free space in a body centred cubic unit cell is

A

34{tex} \% {/tex}

B

28{tex} \% {/tex}

C

30{tex} \% {/tex}

32{tex} \% {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Which of the following statements is not correct?

A

The number of carbon atoms in a unit cell of diamond is {tex} 4 . {/tex}

B

The number of Bravais lattices in which a crystal can be categorized is 14 .

The fraction of the total volume occupied by the atoms in a primitive cell is 0.48 .

D

Molecular solids are generally volatile.

Explanation

Q 20.    

Correct4

Incorrect-1

With which one of the following elements silicon should be doped so as to give {tex} p {/tex}-type of semiconductor?

A

Selenium

Boron

C

Gemanium

D

Arsenic

Explanation

Q 21.    

Correct4

Incorrect-1

If {tex} a {/tex} stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

A

{tex} \frac { 1 } { 2 } a : \frac { \sqrt { 3 } } { 2 } a : \frac { \sqrt { 2 } } { 2 } a {/tex}

B

{tex} 1 a : \sqrt { 3 } a : \sqrt { 2 } a {/tex}

{tex} \frac { 1 } { 2 } a : \frac { \sqrt { 3 } } { 4 } a : \frac { 1 } { 2 \sqrt { 2 } } a {/tex}

D

{tex} \frac { 1 } { 2 } a : \sqrt { 3 } a : \frac { 1 } { \sqrt { 2 } } a {/tex}

Explanation

Q 22.    

Correct4

Incorrect-1

The fraction of total volume occupied by the atoms present in a simple cube is

A

{tex} \frac { \pi } { 3 \sqrt { 2 } } {/tex}

B

{tex} \frac { \pi } { 4 \sqrt { 2 } } {/tex}

C

{tex} \frac { \pi } { 4 } {/tex}

{tex} \frac { \pi } { 6 } {/tex}

Explanation

Q 23.    

Correct4

Incorrect-1

If {tex} \mathrm { NaCl } {/tex} is doped with {tex} 10 ^ { - 4 } \mathrm { mol } \% {/tex} of {tex} \mathrm { SrCl } _ { 2 } {/tex} , the concentration of cation vacancies will be {tex} \left( N _ { A } = 6.02 \times 10 ^ { 23 } \mathrm { mol } ^ { - 1 } \right) {/tex}

A

{tex} 6.02 \times 10 ^ { 16 } \mathrm { mol } ^ { - 1 } {/tex}

{tex} 6.02 \times 10 ^ { 17 } \mathrm { mol } ^ { - 1 } {/tex}

C

{tex} 6.02 \times 10 ^ { 14 } \mathrm { mol } ^ { - 1 } {/tex}

D

{tex} 6.02 \times 10 ^ { 15 } \mathrm { mol } ^ { - 1 } {/tex}

Explanation

Q 24.    

Correct4

Incorrect-1

The appearance of colour in solid alkali metal halides is generally due to

A

interstitial positions

{tex} F {/tex} -centres

C

Frenkel defect.

D

Frenkel defect.

Explanation

Q 25.    

Correct4

Incorrect-1

CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6{tex} \mathrm { pm } {/tex} . Given that the atomic mass of {tex} \mathrm { Cs } = 133 {/tex} and that of {tex} \mathrm { Br } = 80 \mathrm { amu } {/tex} and Avogadro number being {tex} 6.02 \times 10 ^ { 23 } \mathrm { mol } ^ { - 1 } , {/tex} the density of {tex} \mathrm { CsBr } {/tex} is

4.25{tex} \mathrm { g } / \mathrm { cm } ^ { 3 } {/tex}

B

42.5{tex} \mathrm { g } / \mathrm { cm } ^ { 3 } {/tex}

C

0.425{tex} \mathrm { g } / \mathrm { cm } ^ { 3 } {/tex}

D

8.25{tex} \mathrm { g } / \mathrm { cm } ^ { 3 } {/tex}

Explanation