Question 1: Palette 1/44

NEET 2023 MCQ

How many number of tetrahedral voids are formed in $5 \mathrm{~mol}$ of a compound having cubic close packed structure? (Choose the correct option)

A

$1.550 \times 10^{24}$

B

$3.011 \times 10^{25}$

C

$3.011 \times 10^{24}$

D

$6.022 \times 10^{24}$

Question 2: Palette 2/44

NEET 2023 MCQ

How are edge length '$a$' of the unit cell and radius '$r$' of the sphere related to each other in ccp structure? (Choose correct option for your answer)

A

$a=2 r$

B

$a=r / 2 \sqrt{2}$

C

$\mathrm{a}=4 \mathrm{r} / \sqrt{3}$

D

$\mathrm{a}=2 \sqrt{2} \mathrm{r}$

Question 3: Palette 3/44

NEET 2023 MCQ

A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy $1 / 3$ of tetrahedral voids. If the formula of the compound is $\mathrm{A}_{x} \mathrm{B}_{y}$, then the value of $x+y$ is in option

A

4

B

3

C

2

D

5

Question 4: Palette 4/44

NEET 2023 MCQ

What fraction of one edge centred octahedral void lies in one unit cell of fcc?

A

$\frac{1}{3}$

B

$\frac{1}{4}$

C

$\frac{1}{12}$

D

$\frac{1}{2}$

Question 5: Palette 5/44

NEET 2022 MCQ

Match List-I with List-II :

	List-I (Defects)		List-II (Shown by)
(a)	Frenkel defect	(i)	Non-ionic solids and density of the solid decreases
(b)	Schottky defect	(ii)	Non-ionic solids and density of the solid increases
(c)	Vacancy defect	(iii)	Ionic solids and density of the solid decreases
(d)	Interstitial defect	(iv)	Ionic solids and density of the solid remains constant

Choose the correct answer from the options given below :

A

(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

B

(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)

C

(a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)

D

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Question 6: Palette 6/44

NEET 2022 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.

Reason (R) : In an ionic solid, Frankel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both (A) and (R) are correct and (R) is the correct explanation of (A)

B

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

(A) is correct but (R) is not correct

D

(A) is not correct but (R) is correct

Question 7: Palette 7/44

NEET 2022 MCQ

Choose the correct statement:

A

Diamond and graphite have two dimensional network.

B

Diamond is covalent and graphite is ionic.

C

Diamond is sp³ hybridized and graphite is sp² hybridized

D

Both diamond and graphite are used as dry lubricants.

Question 8: Palette 8/44

NEET 2022 MCQ

Copper crystallises in fcc unit cell with cell edge length of 3.608 $\times$ 10^$-$8 cm. The density of copper is 8.92 g cm^$-$3. Calculate the atomic mass of copper.

A

63.1 u

B

31.55 u

C

60 u

D

65 u

Question 9: Palette 9/44

NEET 2021 MCQ

The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

A

3

B

7

C

5

D

2

Question 10: Palette 10/44

NEET 2021 MCQ

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

A

12, 6

B

8, 4

C

6, 12

D

2, 1

Question 11: Palette 11/44

NEET 2020 MCQ

An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :

A

${{\sqrt 2 } \over 4} \times 288$ pm

B

${{4 } \over \sqrt 3} \times 288$ pm

C

${{4 } \over \sqrt 2} \times 288$ pm

D

${{\sqrt 3 } \over 4} \times 288$ pm

Question 12: Palette 12/44

NEET 2019 MCQ

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :

A

C₃A₄

B

C₄A₃

C

C₂A₃

D

C₃A

Question 13: Palette 13/44

NEET 2018 MCQ

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is

A

${{\sqrt 3 } \over {\sqrt 2 }}$

B

${{4\sqrt 3 } \over {3\sqrt 2 }}$

C

${{3\sqrt 3 } \over {4\sqrt 2 }}$

D

${1 \over 2}$

Question 14: Palette 14/44

NEET 2017 MSQ

Which is the incorrect statement?

A

Density decreases in case of crystals with Schottky defect.

B

NaCl_(s) is insulator, silicon is semi conductor, silver is conductor, quartz is piezoelectric crystal.

C

Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal

D

FeO_0.98 has no-stoichimetric metal deficiency defect.

Question 15: Palette 15/44

NEET 2016 MCQ

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca²⁺) and fluoride ion (F^$-$) are

A

4 and 2

B

6 and 6

C

8 and 4

D

4 and 8

Question 16: Palette 16/44

NEET 2016 MCQ

Lithium has a bcc structure. Its density is 530 kg m^$-$3 and its atomic mass is 6.94 g mol^$-$. Calculate the edge length of a unit cell of lithium metal. (N_A = 6.02 $ \times $ 10²³ mol^$-$1)

A

527 pm

B

264 pm

C

154 pm

D

352 pm

Question 17: Palette 17/44

NEET 2016 MCQ

The ionic radii of A⁺ and B^$-$ ions are 0.98 $ \times $ 10^$-$10 m and 1.81 $ \times $ 10^$-$10 m. The coordination number of each ion in AB is

A

8

B

2

C

6

D

4

Question 18: Palette 18/44

NEET 2015 MCQ

The correct statement regarding defects in crystalline solids is

A

Frenkel defects decrease the density of crystalline solids

B

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.

Question 19: Palette 19/44

NEET 2015 MCQ

The vacant space in bcc lattice unit cell is

A

48%

B

23%

C

32%

D

26%

Question 20: Palette 20/44

NEET 2015 MCQ

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

A

80 pm

B

108 pm

C

40 pm

D

127 pm

Question 21: Palette 21/44

NEET 2014 MCQ

If $a$ 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

${2 \over {\sqrt 3 }}a$

B

${4 \over {\sqrt 3 }}a$

C

${{\sqrt 3 } \over 4}a$

D

${{\sqrt 3 } \over 2}a$

Question 22: Palette 22/44

NEET 2013 MCQ

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

A

6

B

1

C

4

D

8

Question 23: Palette 23/44

NEET 2013 MCQ

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm^$-$3. The molar mass of the metal is
(N_A Avogadro's constant = 6.02 $ \times $ 10²³ mol^$-$1)

A

27 g mol^$-$1

B

20 g mol^$-$1

C

40 g mol^$-$1

D

30 g mol^$-$1

Question 24: Palette 24/44

NEET 2012 MCQ

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

A

ABO₂

B

A₂BO₂

C

A₂B₃O₄

D

AB₂O₂

Question 25: Palette 25/44

NEET 2012 MCQ

A metal crystallises with a face-centred cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

A

288 pm

B

408 pm

C

144 pm

D

204 pm

Question 26: Palette 26/44

NEET 2012 MCQ

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

A

1

B

3

C

2

D

4

Question 27: Palette 27/44

NEET 2011 MCQ

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y^$-$) will be

A

275.1 pm

B

322.5 pm

C

241.5 pm

D

165.7 pm

Question 28: Palette 28/44

NEET 2010 MCQ

AB crystallizes in a body centered cubic lattice with edge length '$a$' equal to 387 pm. The distance between two oppositely charged ions in the lattice is

A

335 pm

B

250 pm

C

200 pm

D

300 pm

Question 29: Palette 29/44

NEET 2009 MCQ

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

A

151.8 pm

B

75.5 pm

C

300.5 pm

D

240.8 pm

Question 30: Palette 30/44

NEET 2009 MCQ

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

A

157

B

181

C

108

D

128

Question 31: Palette 31/44

NEET 2008 MCQ

Which of the following statements is not correct?

A

The number of carbon atoms in a unit cell of diamond is 4

B

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

C

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

D

Molecular solids are generally volatile.

Question 32: Palette 32/44

NEET 2008 MCQ

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

A

34%

B

28%

C

30%

D

32%

Question 33: Palette 33/44

NEET 2008 MCQ

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

A

Selenium

B

Boron

C

Germanium

D

Arsenic

Question 34: Palette 34/44

NEET 2008 MCQ

If $a$ 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

${1 \over 2}a:{{\sqrt 3 } \over 2}a:{{\sqrt 2 } \over 2}a$

B

$1a:\sqrt 3 a:\sqrt 2 a$

C

${1 \over 2}a:{{\sqrt 3 } \over 4}a:{1 \over {2\sqrt 2 }}a$

D

${1 \over 2}a:\sqrt 3 a:{1 \over {\sqrt 2 }}a$

Question 35: Palette 35/44

NEET 2007 MCQ

If NaCl is doped with 10^$-$4 mol% of SrCl₂, the concentration of cation vacancies will be (N_A = 6.02 $ \times $ 10²³ mol^$-$1)

A

6.02 $ \times $ 10¹⁶ mol^$-$1

B

6.02 $ \times $ 10¹⁷ mol^$-$1

C

6.02 $ \times $ 10¹⁴ mol^$-$1

D

6.02 $ \times $ 10¹⁵ mol^$-$1

Question 36: Palette 36/44

NEET 2007 MCQ

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

A

${\pi \over {3\sqrt 2 }}$

B

${\pi \over {4\sqrt 2 }}$

C

${\pi \over 4}$

D

${\pi \over 6}$

Question 37: Palette 37/44

NEET 2006 MCQ

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

A

interstitial positions

B

F.-centres

C

Schottky defect

D

Frenkel defect

Question 38: Palette 38/44

NEET 2006 MCQ

CsBr crystallises in a body centered cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02 $ \times $ 10²³ mol^$-$1, the density of CsBr is

A

4.25 g/cm³

B

42.5 g/cm³

C

0.425 g/cm³

D

8.25 g/cm³

Question 39: Palette 39/44

NEET 2005 MCQ

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

A

2

B

4

C

6

D

8

Question 40: Palette 40/44

NEET 2004 MCQ

A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centers. The formula of the compound is :-

A

XY₃

B

X₃Y

C

XY

D

XY₂

Question 41: Palette 41/44

NEET 2003 MCQ

The pyknometric density of sodium chloride crystal is 2.165 $ \times $ 10³ kg m^$-$3 while its X-ray density is 2.178 $ \times $ 10³ kg m^$-$3. The fraction of unoccupied sites in sodium chloride crystal is

A

5.96

B

5.96 $ \times $ 10^$-$2

C

5.96 $ \times $ 10^$-$1

D

5.96 $ \times $ 10^$-$3

Question 42: Palette 42/44

NEET 2001 MCQ

When Zn converts from melted state to its solid state, it has hcp structure, then find the number of nearest atoms.

A

6

B

8

C

12

D

4

Question 43: Palette 43/44

NEET 2000 MCQ

In cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound is

A

AB

B

AB₃

C

A₂B₂

D

A₂B₃

Question 44: Palette 44/44

NEET 2000 MCQ

Cation and anion combines in a crystal to form following type of compound

A

ionic

B

metallic

C

covalent

D

dipole-dipole.