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solid state

Total questions: 150

Worksheet time: 2hrs 32mins

Name
Class
Date
1.
The crystal structure of sodium chloride is
a)
BCC
b)
FCC
c)
amorphous
d)
covalent
2.
What do you call this structure?
a)
FCC
b)
BBC
c)
BCC
d)
CC
3.
How many atoms are there in a BCC crystal unit?
a)
8
b)
4
c)
2
d)
1
4.
How many atoms are there in FCC crystal unit?
a)
8
b)
5
c)
4
d)
3
5.
What is the coordination number of BCC?
a)
12
b)
8
c)
6
d)
4
6.
Zinc sulphide is an example of _____ solid.
a)
Metallic
b)
Covalent
c)
Ionic
d)
Nonpolar
7.
Amorphous solids are anisotropic.
a)
True
b)
False
8.
A) Graphite is a covalent solid. B) Graphite is a good conductor.
a)
A and B are correct
b)
B is correct
c)
A is correct
d)
Both are wrong
9.
Ionic solids are hard and brittle. Covalent solids are good conductors.
a)
A and B are correct.
b)
A is correct
c)
B is correct
d)
Both A and B are wrong
10.
What is the attractive force present in ice?
a)
Ionic bond
b)
Covalent bond
c)
Hydrogen bond
d)
Coordinate bond
11.
What is the coordination number of BCC?
a)
12
b)
8
c)
6
d)
4
12.
Zinc sulphide is an example of _____ solid.
a)
Metallic
b)
Covalent
c)
Ionic
d)
Nonpolar
13.
Amorphous solids are anisotropic.
a)
True
b)
False
14.
Ionic solids are hard and brittle. Covalent solids are good conductors.
a)
A and B are correct.
b)
A is correct
c)
B is correct
d)
Both A and B are wrong
15.

The number of nearest particles which is in direct contact with a particle in a closed packed structure

a)

Unit Cell

b)

Void

c)

Packing efficiency

d)

Coordination number

16.

Crystal system characterized by a ≠ b≠ c and α = β = γ = 90o

a)

Hexagonal

b)

Ortho rhombic

c)

Tetragonal

d)

Triclinic

17.

Smallest repeating unit of crystal lattice

a)

Lattice site

b)

Unit cell

c)

Crystal lattice

d)

Lattice point

18.

In a primitive unit cell atoms are present at the

a)

Corners & Centers of any 2 opposite sides

b)

Corners only

c)

Corners and Body Centre

d)

Corners & Centers of all faces

19.

There are ……….. Bravais lattices corresponding to 7 different Crystal Systems

a)

8

b)

9

c)

14

d)

13

20.

Number of atoms per unit cell in a Face Centered Cubic lattice

a)

4

b)

1

c)

2

d)

6

21.

The wrong statement about Para magnetism

a)

They are weakly attracted by a magnetic field

b)

They are magnetized in a magnetic field in the same direction

c)

They keep their magnetism in the absence of magnetic field

d)

It is due to the presence of one or more unpaired electrons

22.

Example for crystalline solid

a)

Glass

b)

Quartz

c)

Plastic

d)

Rubber

23.

Crystalline solids are

a)

Isotropic

b)

Allotropic

c)

Anisotropic

d)

Isomorphic

24.

Crystal showing both Schottky & Frenkel defect

a)

AgBr

b)

ZnO

c)

AgI

d)

NaCl

25.

Defect shown by ionic crystals with large difference in size

a)

Schottky Defect

b)

Impurity Defect

c)

Frenkel Defect

d)

Metal Deficiency Defect

26.

Anionic sites occupied by unpaired electrons are called

a)

F Centres

b)

Interstitial Centres

c)

Cationic Centres

d)

Anionic Centres

27.

Frenkel defect is also known as

a)

Metal Deficiency Defect

b)

Impurity Defect

c)

Metal Excess Defect

d)

Dislocation Defect

28.

An amorphous solid

a)

CaCl2

b)

NaCl

c)

Glass

d)

CsCl

29.

Defect causing decrease in density

a)

Schottky

b)

Frenkel

c)

F- centre

d)

Metal Excess

30.

An example for Network solid

a)

Corundum

b)

Diamond

c)

Dry Ice

d)

KCl

31.

Density of a crystal is given by the formula

a)

 a3MZNA\frac{a^3M}{ZN_A}  

b)

 NAMZa3\frac{N_AM}{Za^3}  

c)

 ZMa3NA\frac{ZM}{a^3N_A}  

d)

 a3NAZM\frac{a^3N_A}{ZM}  

32.

AB AB … type close packing pattern represents

a)

HCP

b)

FCC

c)

CCP

d)

BCC

33.

The number of atoms per unit cell in simple, fcc and bcc unit cells are

a)

1, 4, 2

b)

1, 2, 4

c)

2, 1, 4

d)

2, 4, 1

34.

In 3D close packing the ABCABCABC.....pattern gives rise to which type of close packing?

a)

Hexagonal Close Packing (hcp)

b)

Cubic Close Packing (ccp)

c)

Face Centred Cubic Packing (fcc)

d)

Both ccp and fcc

35.

The packing efficiency in simple, fcc, bcc unit cells will be respectively

a)

74% 52.4% 68%

b)

52.4% 68% 74%

c)

68% 74% 52.4%

d)

52.4% 74% 68%

36.

The relationship between the atomic radius (r) and edge length (a) of a simple, fcc, bcc cubic unit cell will be respectively

a)

a2\frac{a}{2} 2a4\frac{\sqrt{2}a}{4} 3a4\frac{\sqrt{3}a}{4}

b)

a2\frac{a}{2} 3a4\frac{\sqrt{3}a}{4} 2a4\frac{\sqrt{2}a}{4}

c)

2a4\frac{\sqrt{2}a}{4} 3a4\frac{\sqrt{3}a}{4} a2\frac{a}{2}

d)

3a4\frac{\sqrt{3}a}{4} a2\frac{a}{2} 3a4\frac{\sqrt{3}a}{4}

37.

The coordination number in simple, fcc, bcc close packing arrangement will be respectively

a)

1, 4, 2

b)

6, 12, 8

c)

4, 6, 8

d)

none of the above

38.

The total number of tetrahedral voids and octahedral voids in a given cubic unit cell with N number of atoms will be respectively

a)

2N and N

b)

N and 2N

c)

4N and N

d)

N and 4N

39.

What type of material is this one?

a)

Crystal

b)

Amorphous

c)

Covalent Crystal

d)

Ionic Crystal

40.

What is the coordination number in the FCC structure?

a)

24

b)

12

c)

8

d)

4

41.

In METAL EXCESS DEFECTS the sites where an electron gets trapped in the anionic vacancy disturbing the ratio of cation to anion is known as

a)

E- CENTRE

b)

F- CENTRE

c)

G- CENTRE

d)

I- CENTRE

42.

Which of the following is not a characteristic of a crystalline solid?

a)

Definite and characteristic heat of fusion.

b)

Long range order or perfect arrangement of constituent particles

c)

Isotropic in nature

d)

clean cleavage or smooth edges on cutting with a knife

43.

Which of the following is an amorphous solid?

a)

Copper(Cu)

b)

Quartz glass (SiO2)

c)

Silicon carbide (SiC)

d)

Sodium Chloride (NaCl)

44.

Which of the following is a network solid or covalent crystalline solid?

a)

Diamond (C)

b)

H2O (Ice)

c)

Calcium Fluoride (CaF2)

d)

Iron Metal (Fe)

45.

The type of crystalline solid which is a good conductor in solid as well as molten state?

a)

Ionic Solid

b)

Metallic Solid

c)

Covalent Solid

d)

Molecular Solid

46.

What is the smallest repetitive unit of the crystal / lattice structure known as?

a)

Atom

b)

Molecule

c)

Lattice Point

d)

Unit Cell

47.

The total number of tetrahedral voids and octahedral voids per unit cell of face-centred cell (fcc) are

a)

8, 4

b)

4, 8

c)

2, 4

d)

4, 2

48.

A. Ionic solids are hard and brittle.

B. Covalent solids are good conductors.

a)

A and B are correct.

b)

A is correct

c)

B is correct

d)

Both A and B are wrong

49.

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

a)

32%

b)

34%

c)

28%

d)

20%

50.

In both HCP and CCP the coordination number is

a)

12

b)

6

c)

4

d)

10

51.

Which of the following is a network solid?

a)

SO2(Solid)

b)

I2(Solid)

c)

Diamond

d)

H2O(Ice)

52.

which of the following point defects are shown by AgBr(s) Crystals?

a)

Schottky and impurity

b)

Frenkel and schottky

c)

Frenkel and impurity

d)

Non stoichiometric defect

53.

The percentage of empty space in a face centre cubic arrangement is

a)

74

b)

52

c)

68

d)

26

54.

The electrons are trapped in anionic vacancies in metal excess defect are called

a)

schottky defect

b)

Frenkel defect

c)

f-centre

d)

Impurity defect

55.

The Crystal having highest melting point is

a)

Ionic Crystal

b)

Covalent Crystal

c)

Molecular crystal

d)

Metallic Crystal

56.

Basic crystal systems known are

a)

6

b)

8

c)

7

d)

9

57.

A liquid which is permanently supercooled is frequently called

(a)  

58.

For tetrahedral coordination, the radius ratio should be

(a)  

59.

For tetrahedral coordination, the radius ratio should be

(a)  

60.

For tetrahedral coordination, the radius ratio should be

(a)  

61.

The lattice site in a pure crystal cannot be occupied by

(a)  

62.

Copper has the face centered cubic structure. The coordination number of each ion is

a)

4

b)

12

c)

14

d)

8

63.

Copper has the face centered cubic structure. The coordination number of each ion is

a)

4

b)

12

c)

14

d)

8

64.

The type defect observed in ionic crystals which large difference in the size of ions is:

a)

Interstitial defect

b)

Frenkel defect

c)

Schottky Defect

d)

Stoichiometric Defect

65.

A mixed oxide has ccp arrangement in which the cations 'X' occupy 1/3rd of octahedral voids and the cations 'Y' occupy 1/3rd of tetrahedral voids.The formula of oxide is:

a)

X 2Y 3O 2

b)

XY 3O

c)

X 2YO 3

d)

XY 2O 3

66.

An element with molar mass 64 gmol -1 and density 6.6 g cm -3 forms a cubic unit cell.The edge length of unit cell is 4 x 10 -8cm.The type of cubic unit cell formed is ?

a)

fcc

b)

ccp

c)

bcc

d)

hcp

67.

A solid is made up of 2 elements P and Q. Atoms Q are in ccp arrangement,while P atoms occupy all the tetrahedral sites.The formula of the compound is:

a)

PQ 2

b)

P 6Q 4

c)

P 2Q

d)

PQ

68.

A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. The formula of the compound is :

a)

X 2Y

b)

X 4Y

c)

XY

d)

XY 2

69.

A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. The formula of the compound is :

a)

X 2Y

b)

X 4Y

c)

XY

d)

XY 2

70.

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. The formula of the compound formed by the elements A and B is:

a)

A 4B 3

b)

A 2B

c)

A 3B 4

d)

AB

71.

An element with molar mass 2.7 x 10 -2 kg mol -1 forms a cubic unit cell with edge length 405 pm. If its density is 2.7 x 10 3 kg m -3,the nature of cubic unit cell is :

a)

hcp

b)

ccp

c)

bcc

d)

fcc

72.

Name the defects noticed when a solid is heated.

a)

Frenkel Defect

b)

Interstitial Defect

c)

Schottky Defect

d)

Vacancy Defect

73.

Name the defects noticed when a solid is heated.

a)

Frenkel Defect

b)

Interstitial Defect

c)

Schottky Defect

d)

Vacancy Defect

74.

How many unit cells are divided equally in a face-centred cubic lattice?

a)

2

b)

4

c)

6

d)

8

75.

A crystalline solid:

a)

changes abruptly from solid to liquid when heated.

b)

has no definite melting point.

c)

undergoes deformation of its geometry easily

d)

has irregular 3-dimensional arrangements.

76.

In a simple cubic, body-centered cubic and face-centered cubic structure, the ratio of the number of atoms present is respectively.

a)

4:2:3

b)

8:1:6

c)

1:2:4

d)

4:2:1

77.

Na and Mg crystallize in crystals of bcc and fcc form respectively and then the amount of Na and Mg atoms present in their respective crystal unit cells is:

a)

4 and 2

b)

9 and 14

c)

14 and 9

d)

2 and 4

78.

For orthorhombic system axial ratios are a b c and the axial angles are:

a)

α = β = γ ≠ 90

b)

α ≠ β ≠ γ ≠ 90

c)

α = β = γ = 90

d)

α ≠ β ≠ γ = 90

79.

Copper crystalline in FCC with a unit cell length of 361pm. What is the radius of a copper atom?

a)

127pm

b)

123pm

c)

181pm

d)

167pm

80.

Schottky defect in crystal is observed when

a)

The ion leaves its normal position and occupies an interstitial location

b)

unequal number of cation and anions are missing from the lattice

c)

density of the crystal increases.

d)

an equal number of cations and anions are missing from the lattice.

81.

Each of the following solids show, the Frenkel defect except

a)

ZnS

b)

AgBr

c)

AgI

d)

KCl

82.

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

a)

288 pm

b)

408 pm

c)

144 pm

d)

204 pm

83.

A solid X+ Y- has a bcc structure . If the distance of closest approach between the two ions is 173 pm, the edge length of the cell is :

a)

200 pm

b)

142.2 pm

c)

Under root 2 pm

d)

178 pm

84.

Which one is not the property of a crystalline solid?

a)

Isotropic

b)

Sharp melting point

c)

A definite and regular geometry

d)

High intermolecular forces.

85.

Which defect causes decrease in the density of a crystal?

a)

Interstitial

b)

Frenkel

c)

Schottky

d)

F-Centre

86.

The white ZnO turns yellow on heating because of

a)

Frenkel defect

b)

Metal excess defect

c)

metal deficiency defect

d)

Schottky defect

87.

Three elements A,B and C crystallise into a cubic solid lattice. Atom A occupy the corners,B occupy the cube centres and C occupy the edges. The formula of the compound is

a)

ABC

b)

ABC2

c)

ABC3

d)

ABC4

88.

Which of the following is a molecular crystal?

a)

Rock salt

b)

Quartz

c)

Diamond

d)

Dry ice

89.

AB 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:

a)

200 pm

b)

300 pm

c)

335 pm

d)

250 pm

90.

Percentage of free space in bcc lattice is :

a)

32

b)

24

c)

48

d)

52

91.

The crystal with metal deficiency defect is

a)

Nacl

b)

FeO

c)

KCl

d)

ZnO

92.

The most unsymmetrical and symmetrical system are respectively:

a)

tetragonal , cubic

b)

triclinic , cubic

c)

rhombohedral, hexagonal

d)

orthorombic, cubic

93.

In Zinc blende structure ,the coordination number of the cation is:

a)

4

b)

8

c)

6

d)

12

94.

The total number of possible 3-dimensional arrangements in a crystal lattice

a)

7

b)

14

c)

12

d)

8

95.

The only possible type of unit cell in a rhombhohedral crystal system

(a)  

96.

How many tetrahedral voids are present in cubic close packed crystal structure?

a)

4

b)

8

c)

12

d)

6

97.

Example for crystalline solid

a)

Glass

b)

Quartz

c)

Plastic

d)

Rubber

98.

Which of the following is a network solid or covalent crystalline solid?

a)

Diamond (C)

b)

H2O (Ice)

c)

Calcium Fluoride (CaF2)

d)

Iron Metal (Fe)

99.

The packing efficiency in simple, fcc, bcc unit cells will be respectively

a)

74% 52.4% 68%

b)

52.4% 68% 74%

c)

68% 74% 52.4%

d)

52.4% 74% 68%

100.

Analysis shows that FeO has a non-stoichiometric composition with formula Fe0·95O. Give reason.

a)

Schottky defect

b)

Frenkel defect

c)

Metal excess defect

d)

Metal deficiency defect

101.

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

a)

0.607 nm

b)

0.407 nm

c)

6.07 nm

d)

4.07 nm

102.

A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound?

a)

PQ

b)

P2Q

c)

PQ2

d)

PQ4

103.

Iron oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by iron ions. What is the formula of the iron oxide?

a)

FeO

b)

Fe2O3

c)

Fe3O4

d)

None of these

104.

The relationship between the radius (r) of the tetrahedral void and the radius (R) of the atoms in close packing is

a)

r = 0.155 R

b)

r = 0.225 R

c)

r = 0.414 R

d)

r = 0.732 R

105.

The crystal system where all sides are equal and all angles are equal to 90 degree is (a)  

106.

The percentage of empty space in a ccp arrangement is

a)

74

b)

26

c)

68

d)

52.4

107.

The coordination number in NaCl (simple), ZnS (fcc) and CsCl (bcc) is 6, 12 and 8 respectively. The ionic compounds which will be exhibiting Schottky Defect will be

a)

NaCl, ZnS

b)

ZnS, CsCl

c)

NaCl, CsCl

d)

all will exhibit

108.

When NaCl crystal is doped with MgCl 2 , the nature of defect produced is

a)

Schottky defect

b)

Frenkel defect

c)

Impurity defect

d)

none of the above

109.

The metal deficiency defect which occurs when the metal can exhibit variable valencies is usually observed in oxides of

a)

alkali metals

b)

alkaline earth metals

c)

transition metals

d)

all of the above

110.

The distance between Na– and CL– ions in NaCl with a density 2.165 g cm-3 is

a)

(a) 564 pm

b)

(b) 282 pm

c)

(c) 234 pm

d)

(d) 538 pm

111.

An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is

a)

(a) 10.37 g cm-3

b)

(b) 5.19 g cm-3

c)

(c) 7.29 g cm-3

d)

(d) 2.14 g cm-3

112.

Which of the following crystals does not exhibit Frenkel defect?

a)

(a) AgBr

b)

(b) AgCl

c)

(c) KBr

d)

(d) ZnS

113.

What type of stoichiometric defect is shown by ZnS?

a)

(a) Schottky defect

b)

(b) Frenkel defect

c)

(c) Both Frenkel and Schottky defects

d)

(d) Non-stoichiometric defect

114.

How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 g cm-3? (Atomic mass of Li = 6.94):

a)

(a) 2

b)

(b) 1

c)

(c) 4

d)

(d) 6

115.

The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is

a)

(a) 110 pm

b)

(b) 220 pm

c)

(c) 285 pm

d)

(d) 144 pm

116.

The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is

a)

(a) 110 pm

b)

(b) 220 pm

c)

(c) 285 pm

d)

(d) 144 pm

117.

An element has body centred cubic structure with a cell edge of 3.0 Å. The density of the metal is 2 amu/Å3. Atoms present in 243 × 1024 amu of the element are 9 × 10x

then X is Equals to

(a)  

118.

The composition of a sample of wustite is Fe0.93O1.0. What percentage of iron is present in the form of Fe(III)?

(a)  

119.

A solid has a structure in which W atoms are

located at the corners of a cubic lattice. O atom

at the centre of the edges and Na atom at centre

of the cubic. The formula for the compound is -

a)

(A) NaWO2

b)

(B) NaWO3

c)

C) Na2WO3

d)

(D) NaWO4

120.

Three lines are drawn from a single corner of

an FCC unit cell to meet the other corner such

that they are found to pass through exactly 1

Octahedral void only, no voids of any type

and exactly 2 tetrahedral voids with exactly 1

Octahedral void only. Identify the line in the

same order -

a)

(a) Edge, Face diagonal, Body diagonal

b)

(b) Face diagonal, Edge Body diagonal

c)

(c) Body diagonal, Face diagonal Edge

d)

(d) Edge, Body diagonal, Face diagonal

121.

Given an alloy of Cu, Ag and Au in which Cu

atoms constitute the CCP arrangement. If the

hypothetical formula of the alloy is

Cu4Ag3Au . What are the probable locations

of Ag and Au atoms -

a)

(a) Ag – all Tetrahedral voids; Au – all

Octahedral voids

b)

(b) Ag – 3/8th Tetrahedral voids; Au- 1/4th

Octahedral voids

c)

(c) Ag – 1/2 Octahedral voids; Au – 1/2

Tetrahedral voids

d)

(d) Ag – all Octahedral voids; Au – all

tetrahedral voids

122.

.................... solids gradually soften over a range of temperature.

a)

crystalline

b)

amorphous

123.

The molecules of hydrogen bonded molecular solids contain .................... covalent bonds between H and F, O or N atoms.

a)

polar

b)

non polar

c)

coordinate

124.

................. are orderly collection of positive ions surrounded by and held together by a sea of free electrons

a)

Metals

b)

Non metals

c)

metalloids

125.

A space lattice is also called ...........

a)

crystal lattice

b)

motif

c)

unit cell

126.

A unit cell is characterized by how many parameters?

a)

4

b)

5

c)

6

d)

7

127.

In monoclinic crystal system, which among the following variations are possible?

a)

Primitive, End-centred

b)

Body-centred, Face-centred

c)

Primitive, Body-centred, Face-centred, End-centred

d)

Primitive, Body-centred, Face-centred

128.

1. Which one of the following is a good conductor of electricity?

a)

Diamond

b)

Graphite

c)

Silicon

d)

Amorphous carbon

129.

The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have co-ordination number 8. The crystal class is:

a)

Simple cube

b)

Body centred cube

c)

Face centred cube

d)

None

130.

The total number of Bravais lattice in a crystal is:

a)

7

b)

14

c)

16

d)

32

131.

The edge length of FCC unit cell is 508 pm. if the radius of the cation is 110 pm, the radius of the anion is:

a)

285 pm

b)

398 pm

c)

144 pm

d)

618 pm

132.

8. Crystalline solid are:

a)

Glass

b)

Rubber

c)

Plastic

d)

Sugar

133.

9. The number of octahedral sites per sphere in FCC structure is:

a)

8

b)

4

c)

2

d)

1

134.

Quartz is a crystalline variety of :

a)

Silica

b)

Sodium silicate

c)

Silicon carbide

d)

Silicon

135.

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

a)

A. AB

b)

AB3

c)

A3B

d)

A2B

136.

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be:

a)

A. AB

b)

AB3

c)

A3B

d)

A2B

137.

A compound is formed by elements X and Y. This crystallizes in the cubic structure when atoms X are the corners of the cube and atoms Y are the centre of the body. The simplest formula of the compound is:

a)

XY

b)

XY2

c)

X2Y

d)

XY4

138.

In a FCC cell, an atom at the face contributes to the unit cell:

a)

1/4 part

b)

1/2 part

c)

1/8 part

d)

1 part

139.

In graphite, carbon atoms are joined together due to:

a)

Ionic bonding

b)

Van der Waals' forces

c)

Metallic bonding

d)

Covalent bonding

140.

In graphite, carbon atoms are joined together due to:

a)

Ionic bonding

b)

Van der Waals' forces

c)

Metallic bonding

d)

Covalent bonding

141.

In graphite, carbon atoms are joined together due to:

a)

Ionic bonding

b)

Van der Waals' forces

c)

Metallic bonding

d)

Covalent bonding

142.

Among solids the highest melting point is established by:

a)

Covalent solid

b)

Pseudo solid

c)

Molecular solid

d)

Ionic solid

143.

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)

10 pm

b)

127 pm

c)

40 pm

d)

108 pm

144.

An AB2 type structure is found in:

a)

NaCl

b)

Al2O3

c)

CaF2

d)

N2O

145.

An element ‘X’ (At. mass = 40 g mol–1) having f.c.c. structure, has unit cell edge length of 400 pm. Calculate the density of ‘X’ .

a)

4.15 gcm-3

b)

4.15 gcm3

c)

41.5 gcm-3

d)

0.415 gcm-3

146.

Which type of defect has the presence of cations in the interstitial site?

a)

Schottky defect

b)

Frenkel defect

c)

Metal deficiency defect

d)

Vacancy defect

147.

Metal deficiency defect due to:-

a)

missing of anion

b)

excess of cation

c)

missing of cation

d)

both a and b

148.

Which solids are also called pseudo solid?

a)

Amorphous

b)

crystalline

c)

regular solid

d)

true solid

149.

An element crystallizes as face centred cubic lattice with an edge length of 460pm. Compute the density of the element, when the molar mass of X is 60 g mol-1

a)

4.096g/cm3

b)

50.3g/cm3

c)

6.05g/cm3

d)

4075g/cm3

150.

For iron the edge length of the cubic unit cell is 286pm and its density is 7.86 g/cm3. Calculate the radius of Fe. RMM of Fe is 55.85 and Avogadros' constant is 6.023x1023

a)

128.8pm

b)

273.9pm

c)

546pm

d)

123.8 pm

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