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Solid state revision

Total questions: 50

Worksheet time: 42mins

Name
Class
Date
1.

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

a)

Hexagonal

b)

Ortho rhombic

c)

Tetragonal

d)

Triclinic

2.

Smallest repeating unit of crystal lattice

a)

Lattice site

b)

Unit cell

c)

Crystal lattice

d)

Lattice point

3.

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

4.

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

a)

8

b)

9

c)

14

d)

13

5.

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

a)

4

b)

1

c)

2

d)

6

6.

Example for crystalline solid

a)

Glass

b)

Quartz

c)

Plastic

d)

Rubber

7.

Crystalline solids are

a)

Isotropic

b)

Allotropic

c)

Anisotropic

d)

Isomorphic

8.

Crystal showing both Schottky & Frenkel defect

a)

AgBr

b)

ZnO

c)

AgI

d)

NaCl

9.

Anionic sites occupied by unpaired electrons are called

a)

F Centres

b)

Interstitial Centres

c)

Cationic Centres

d)

Anionic Centres

10.

Frenkel defect is also known as

a)

Metal Deficiency Defect

b)

Impurity Defect

c)

Metal Excess Defect

d)

Dislocation Defect

11.

Defect causing decrease in density

a)

Schottky

b)

Frenkel

c)

F- centre

d)

Metal Excess

12.

An example for Network solid

a)

Corundum

b)

Diamond

c)

Dry Ice

d)

KCl

13.

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}  

14.

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

15.

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

16.

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%

17.

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}

18.

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

19.

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

20.

What type of material is this one?

a)

Crystal

b)

Amorphous

c)

Covalent Crystal

d)

Ionic Crystal

21.

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

a)

32%

b)

34%

c)

28%

d)

20%

22.

In both HCP and CCP the coordination number is

a)

12

b)

6

c)

4

d)

10

23.

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

24.

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

25.

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

26.

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

27.

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

28.

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

29.

The crystal with metal deficiency defect is

a)

Nacl

b)

FeO

c)

KCl

d)

ZnO

30.

The most unsymmetrical and symmetrical system are respectively:

a)

tetragonal , cubic

b)

triclinic , cubic

c)

rhombohedral, hexagonal

d)

orthorombic, cubic

31.

Atom arranged in simple unit cell at:-

a)

Corners

b)

face

c)

in body

d)

none of these

32.

Which solids are also called pseudo solid?

a)

Amorphous

b)

crystalline

c)

regular solid

d)

true solid

33.

The Crystal having highest melting point is

a)

Ionic Crystal

b)

Covalent Crystal

c)

Molecular crystal

d)

Metallic Crystal

34.

Schottky defect is observed in crystals when

a)

some cations move from their lattice site to interstitial sites

b)

equal number of cations and anions are missing from the lattice

c)

some lattice sites are occupied by electrons

d)

some imurity is present in the lattice

35.

Frenkel defect is observed in crystals when

a)

some cations move from their lattice site to interstitial sites

b)

equal number of cations and anions are missing from the lattice

c)

some lattice sites are occupied by electrons

d)

some imurity is present in the lattice

36.

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

37.

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

38.

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

39.

In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

(a) Both assertion and reason are true and the reason is the correct explanation of assertion.

(b) Both assertion and reason are true and the reason is not the correct explanation of assertion.

(c) Assertion is true but the reason is false.

(d) Assertion is false but reason is true.

4 lines
40.

Assertion : Crystalline solids have short range order. Reason : Amorphous solids have long range order.

a)

A

b)

B

c)

C

d)

D

41.

13. Assertion : In any ionic solid (MX) with Schottky defects, the number of positive and negative ions are same.

Reason : Equal number of cation and anion vacancies are present.

a)

A

b)

B

c)

C

d)

D

42.

14. Assertion : The total number of atoms present in a simple cubic unit cell is one.

Reason : Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.

a)

A

b)

B

c)

C

d)

D

43.

Assertion : Graphite is a good conductor of electricity however diamond belongs to the category of insulators. Reason : Graphite is soft in nature on the other hand diamond is very hard and brittle.

a)

A

b)

B

c)

C

d)

D

44.

Assertion: Frenkel and schottky defects are stoichiometric defects.

Reason: Both defects change the density of the crystalline solid.

a)

A

b)

B

c)

C

d)

D

45.

Assertion: In Frenkel defect , density of the crystalline solid does not change.

Reason: In Frenkel defect, no cation or anion leaves the crystal.

a)

A

b)

B

c)

C

d)

D

46.

Assertion: FeO is non-stoichiometric with Fe0.95O.

Reason: Some Fe2+ ions are replaced by Fe3+.

a)

A

b)

B

c)

C

d)

D

47.

Radius ratio of the octahedral void

a)

1.000

b)

0.732

c)

0.224

d)

0.414

48.

Li vapors heated in LICl gives

a)

purple

b)

pink

c)

yellow

d)

None of the above

49.

Oxygen is an example of

a)

diamagnetic substance

b)

paramagnetic substance

c)

ferromagnetic substance

d)

none of these

50.

Diamond cannot conduct electricity because

a)

diamond has the structure of a giant covalent molecule

b)

its carbon atoms form single covalent bonds

c)

all of its valence electrons are used in forming covalent bonds

d)

it has a higher melting point

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