The Solid State Questions

We provide the solid state practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the solid state skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.

The Solid State Questions

List of the solid state Questions

Question NoQuestionsClass
1Question 13. Explain how much portion of an atom located at
(i) corner?
(ii) body-centre of a cubic unit cell is part of its neighbouring unit cell?
12
2Q. 13 Which of the following oxides behaves as conductor or insulata
depending upon temperature?
(a) Tio
(b) SiO2
(c) Tio
(d) Mgo
12
38.14 Which of the following oxides shows electrical properties like metals?
(a) SiO2
(b) Mgo
(c) SO2(5) (d) CrO2
An
7
12
4Question 17. Which of the following lattices has the highest packing
efficiency?
(1) Simple cubic
(ii) Body-centred cubic
(iii) Hexagonal close-packed lattice
12
5Question 8. Ionic solids conduct electricity in molten state but not in
solid state. Explain.
tip ploctricity and in solid
12
6Question 24. What type of substances would make better permanent
magnets, ferromagnetic or ferrimagnetic? Justify your answer.
12
7Question 4. Why does table salt NaCl sometimes apper yellow in
colour?
12
8Question 3. Classify the following as amorphous or crystalline solids :
polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate,
cellophane, polyvinyl chloride, fibre glass, copper.
12
9Question 22. In terms of band theory, what is the difference
(1) between a conductor and an insulator?
(ii) between a conductor and a semiconductor?
12
10Question 4. Why is glass considered a supercooled liquid?12
11stal it
Q. 33 The correct order of the packing efficiency in different types of unit cells
(a) fcc < bcc < simple cubic
(c) fcc simple cubic
Donline fisione in ita
(b) fcc > bcc > simple cubic
(d) bcc simple cubic
nech
u
nitello
bo tobuiloto
12
12Question 6. Why does white ZnO(s) becomes yellow upon heating?
.
12
13Question 10. A sample of ferrous oxide has actual formula Fe0.9301.00. In
this sample what fraction of metal ions are Fe + ions? What type of
non-stoichiometric defect is present in this sample?
12
14Question 19. What type of defect can arise when a solid is heated
ach physical property is affected by it and in what way?
12
15Question 20. What type of stoichiometric defect is shown by
(1) Zns
(ii) AgBr
12
16Q. 21 The total number of tetrahedral voids in the face centred unit cell
(a) 6 si stim (b) 8 imbenoir (c) 10 o 9(d) 12 pady
Thinking Process 2010 bolou 916 29
number of atoms in foc unit cell =
N
o mani
Number of tetrahedral voids IN
Yleisis enine bas at
Number of octahedral voids =
N 906b bacio Vianabol
12
17Q. 66 Match the types of defect given in Column I with the statement given in
Column II.
A.
B.
C.
Column
Impurity defect
Metal excess defect
Metal deficiency defect
1.
2.
3.
Column II
NaCl with anionic sites called F-centres
FeO with Fe3+
NaCl with Sr2+ and some cationic sites vacant
12
1811. Name the parameters that characterise a unit cell.12
193. If Mis the atomic mass and A is the mass number, packing
fraction is given by
A
A-M
M-A
M
M -A
(a)
A
(c)
M-A
a
12
20Question 8. Explain why does conductivity of germanium crystals
increase on doping with galium?
12
21Question 5. Why is FeO(s) not formed in stoichiometric composition?12
22Question 22. Ionic solids, which have anionic vacancies due to metal
excess defect, develop colour. Explain with the help of a suitable example.
12
23Question 10. Calculate the efficiency of packing in case of a metal
crystal for
(i) simple cubic
(ii) body-centred cubic
(ii) face-centred cubic (with the assumptions that atoms are touching
each other).
Packing efficiency
Volume occupied by the spheres present in the unit cell x 100
Total volume of the unit cell
(1) First calculate the volume occupied by the spheres present in the unit
cell by multiplying Ter with number of atoms present in the unit cell.
(ii) Calculate the total volume of the unit cell.
(iii) Calculate packing efficiency from the formula.
12
24Question 23. A group 14 element is to be converted into type
semiconductor by doping it with a suitable impurity. To which group
should this impurity belong?
12
25Q. 34 Which of the following defects is also known as dislocation defect?
(a) Frenkel defect
(b) Schottky defect
(c) Non-stoichiometric defect
(d) Simple interstitial defect
12
26voids of
ids of the
esent at
of given
2. 31 Which of the following is not true about the ionic solids?
(a) Bigger ions form the close packed structure
(b) Smaller ions occupy either the tetrahedral or the octahedral voids depending
upon their size
(c) Occupation of all the voids is not necessary
(d) The fraction of octahedral or tetrahedral voids occupied depends upon the radii
of the ions occupying the voids
ns (0) The fraction of octahedrol or otrobedrol voide Cupied denends upon the radij of the
12
27a spolehli
Q. 30 Which of the following statements is not true?
(a) Paramagnetic substances are weakly attracted by magnetic field
(b) Ferromagnetic substances cannot be magnetised permanently
(c) The domains in antiferromagnetic substances are oppositely oriented with
respect to each other
(d) Pairing of electrons cancels their magnetic moment in the diamagnetic
substances
12
28Q. 51 In which of the following arrangements octahedral voids are formed?
(a) hop
(b) bcc
(C) simple cubic (d) fcc
Ans.(a )
12
29Q. 16 Graphite cannot be classified as ………
(a) conducting solid
(b) network solid
(c) covalent solid
(d) ionic solid
bit
L
_
I
12
30Question 21. Gold (atomic radius = 0.144 nm) crystallises in a
face-centred unit cell. What is the length of a side of the cell?
12
31One of the properties of glass is its transparency. This
property of glass is due to
(a) its high viscosity
(b) regular arrangement of silicate units in glass.
(c) irregular arrangement of silicate units in glass.
(d) its high coefficient of thermal expansion.
12
32Q. 24 The percentage of empty space in a body centred cubic arrangement is
……
(a) 74
(b) 68
(c) 32
(d) 26
12
33Question 9. In a compound, nitrogen atoms (N) make cubic close
packed lattice and metal atoms (M) occupy one-third of the tetrahedral
voids present. Determine the formula of the compound formed by M and
N?
12
34Q19. Name the
Name the non-stoichiometric point defect responsible for colour in alkali metal halides.
votleycess defector -centres whicbi1
12
350.4 Which of the following arrangements shows schematic alignment of
magnetic moments of antiferromagnetic substances?
(b) 0 0 0 0 0 0
0 0 0 0 0 0
12
36Q. 40 Which of the following statements are not true?
(a) Vacancy defect results in a decrease in the density of the substance
(b) Interstitial defects results in an increase in the density of the substance
(c) Impurity defect has no effect on the density of the substance
(d) Frenkel defect results in an increase in the density of the substance
12
37Question 5. Refractive index of a solid is observed to have the same
value along all directions. Comment on the nature of this solid. Would it
show cleavage propertyP
12
38meng it and couny It Tapiury.
Question 3. Classify each of the following solids as ionic, metallic
molecular, network (covalent) or amorphous.
(i) Tetraphosphorus decoxide (P,010) (vii) Graphite
(i) Ammonium phosphate, (NH)3PO, (viii) Brass
(iii) Sic
(ix) Rb
(iv) 12
(x) LiBr
(v) P
(xi) Si
(vi) Plastic
12
39Question 4. (i) What is meant by the term ‘coordination number?
(ii) What is the coordination number of atoms
(a) in a cubic close-packed structure?
(b) in a body-centred cubic structure
(1) The number of neighbouring particles for a particle is its coordination
number.
(ii)
5
2
ccp structure
bcc structure
12
40Question 6. Classify the following solids in different categories based
on the nature of intermolecular forces operating in them :
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide,
graphite, rubidium, argon, silicon carbide.
12
41to positive holes, it is a p-type sem
Question 19. Ferric oxide crystallises in a hexagonal close-packed array
of oxide ions with two out of every three octahedral holes occupied by
ferric ions. Derive the formula of the ferric oxide.
Solution. There is one octahedral hole for each atom in hexagonal
close packed arrangement. If the number of oxide ions (04) per unit cell
is 1, then the number of Fe+ ions = 273 x octahedral holes
= 2/3 x1=2/3. Thus, the formula of the compound = Fe2/3 O, or Fe,Og.
12
42Q. 58 Why is Feo(s) not formed in stoichiometric composition?
21
3+
12
43Question 12. A cube solid is made up of two elements P and Q. Atom
of Q are at the corners of the cube and P at the body-centre. What is
the formula of the compound? What are the coordination numbers of
P and Q?
12
44Question 15. Copper crystallises into a foc lattice with edge length
3.61 x 10 cm. Show that the calculated density is in agreement with its
measured value of 8.92 g cm3.
12
45Q. 23 In which pair most efficient packing is present?
(a) hcp and bcc
(b) hcp and cop 10
(c) bcc and ccp
(d) bcc and simple cubic cell
Ane (5) packing officians in the mount
12
46Question 9. What type of solids are electrical conductors, malleable and
ductile?
12
47uyul UUU U SUICHUI
Bect.
0.53 Which of the following defects decrease the density?
(a) Interstitial defect
(b) Vacancy defect
(c) Frenkel defect
(d) Schottky defect
12
48Q. 44 An excess of potassium ions makes KCl crystals appear violet or lilac in
colour since ………. .
(a) some of the anionic sites are occupied by an unpaired electron
(b) some of the anionic sites are occupied by a pair of electrons
(c) there are vacancies at some anionic sites
(d) F-centres are created which impart colour to the crystals
12
49Question 7. Solid ‘A’ is a very hard electrical insula
in molten state and melts at extremely high temperau
solid is it?
electrical insulator in solid as well as
hely high temperature. What type of
12
500.38 Which of the following is not true about the voids formed in 3
dimensional hexagonal close packed structure?
(a) A tetrahedral void is formed when a sphere of the second layer is present above
triangular void in the first layer
(b) All the triangular voids are not covered by the spheres of the second layer
(c) Tetrahedral voids are formed when the triangular voids in the second layer lie
above the triangular voids in the first layer and the triangular shapes of these
voids do not overlap
(d) Octahedral voids are formed when the triangular voids in the second layer
exactly overlap with similar voids in the first layer
12
51Q. 36 The edge lengths of the unit cells in terms of the radius of spheres
constituting foc, bcc and simple cubic unit cells are respectively ….
(b) 4,2727, 27
(c) 2r, 2v2r4
(d) 2r, 4, 2127
(a) 2/27, 73,21
12
52Q.5 Which of the following is true about the value of refractive index of quartz
glass?
(a) Same in all directions
(b) Different in different directions
(c) Cannot be measured
(d) Always zero
12
53Q. 12 Graphite is a good conductor of electricity due to the presence of
(a) lone pair of electrons
(b) free valence electrons
(c) cations
(d) anions
12
54Q. 3 Which of the following is an amorphous solid?
(a) Graphite (C)
(b) Quartz glass (SiO2)
(c) Chrome alum
(d) Silicon carbide ( SiC)
12
55Q. 46 Amorphous solids can also be called ……..
(a) pseudo solids
(b) true solids
(c) super cooled liquids
(d) super cooled solids
12
56Question 8. How many lattice points are there in one unit cell of each
of the following lattice?
(1) Face-centred cubic
(ü) Face-centred tetragonal
(iii) Body-centred
Recall the structure of different types of unit cell and find the number of
corner atom, face centred atoms and body centred atom per unit cell and
add them to find the lattice points present in a unit cell. In foc unit cell, one
atom is present at each corner and each of the face centre. (In bcc unit cell
one atom is present at each corner and one is present at body centre.)
12
57Q.50 Which of the following cannot be regarded as molecular solid?
(a) SiC (silicon carbide)
(b) AIN
(c) Diamond
(d) I
12
58Question 11. Silver crystallizes in fcc lattice. If edge length of the cellis
4.07 x 10-8 cm and density is 10.5 g cm , calculate the atomic mass of
silver.
O
Atomic mass = **, *NA and Z = 4 for fec lattice.
12
59Question 6. Stability of a crystal is reflected in the magnitude of its
melting points’, Comment. Collect melting points of solid water, ethyl
alcohol, diethyl ether and methane from a data book. What can you say
about the intermolecular forces between these molecules?
12
602. 10 Which of the following solids is not an electrical conductor?
1. Mg(s) 2. Tio (s) 3. Iz (s) 4. H₂O (s)
(a) Only 1
(b) Only 2
(c) 3 and 4
(d) 2, 3 and 4
12
61Question 2. What makes a glass different from a solid such as quartz
Under what condition could quartz be converted into glass?
12
620.52 Frenkel defect is also known as
(a) stoichiometric defect
(c) impurity defect
(b) dislocation defect
(d) non-stoichiometric defect
12
63Q. 22 Which of the following point defects are shown by Ag Br(s) crystals?
1. Schottky defect
199 2. Frenkel defecto
ano
UBI O
3. Metal excess defect20
4. Metal deficiency defect
(a) 1 and 2 (b) 3 and 4 (c) 1 and 3 (d) 2 and 4
A
12
64Q. 3 Which of the following is an amorphous solid?
(a) Graphite (C)
(b) Quartz glass (SiO2)
(c) Chrome alum
(d) Silicon carbide ( SiC)
12
65Assertion : With rise of temperature Germanium acts as a
semi-conductor
Reason: It shows metallic property.
12
66Q. 25 Which of the following statement is not true about the hexagonal close
packing?
(a) The coordination number is 12 i dodaliw bob no 2
(b) It has 74% packing efficiency
(c) Tetrahedral voids of the second layer are covered by the spheres of the third
layer
(d) In this arrangement spheres of the fourth layer are exactly aligned with those of
the first layer
12
67Q15. What is the total number of atoms per unit cells in a face-centred cubic (fcc) structure?12
68Question 1. Define the term ‘amorphous’. Give a few examples of
amorphous solids.
12
69Question 1. Why are solids rigid?12
70mlay-ue
Uuuteu, uereiure, Crystals are usually hot por
0.57 Why does table salt, NaCl sometimes appear yellow in colour?
tal van defect due to which paired
Vai NO
12
71Question 1. Why are liquids and gases categorised as fluids?12
72Question 21. Explain how vacancies are introduced in an ionic solid
when a cation of higher valence is added as an impurity in it?
12
730.45 The number of tetrahedral voids per unit cell in NaCl crystal is ……….
(a) 4
(b) 8
(c) twice the number of octahedral voids
(d) four times the number of octahedral voids
12
74Q. 28 Which kind of defects are introd
Vhich kind of defects are introduced by doping!
(a) Dislocation defect
(b) Schottky defect
(C) Frenkel defect
(d) Electronic defect
12
75Q. 49 Which of the following features are not shown by quartz glass?
(a) This is a crystalline solid
(b) Refractive index is same in all the directions
(c) This has definite heat of fusion
(d) This is also called super cooled liquid
12
76021. Why is glass considered a super cooled liquid?
1
T
12
77Q. 6 Which of the following statement is not true about amorphous solids?
(a) On heating they may become crystalline at certain temperature
(b) They may become crystalline on keeping for long time
(c) Amorphous solids can be moulded by heating
(d) They are anisotropic in nature
12
78Q18. What makes the crystal of KCl appear sometimes violet12
79Question 2. Why do solids have a definite volume?12
80Q16. What is the number of atoms per unit cell in a body-centred cubic structure!12
81Q. 18 Schottky defect is observed in crystals when ………. 10.103
(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 impurity is present in the lattice
12
82Q. 47 A perfect crystal of silicon (fig) is doped with some elements as given in
the options. Which of these options shows n-type semiconductors?
0:0:0:0:
0:0:0:0:
Pure crystal
0:0:0:0:
0:0:0:0
0000 0000
0:0:0:0:0:0:0:0
0:0:0:0:0:0:0:0
0:0:0:0
0:0:0:0
12
83Question 7. Why does the electrical conductivity of semiconductors
increase with rise in temperature?
12
84Q. 4 Which of the following arrangements shows schematic alignment
magnetic moments of antiferromagnetic substances?
(b)
(c) ©
0 0 0 0 0
0 0 0 0 0
12
85Q. 15 The lattice site in a pure crystal cannot be occupied by ……….
(a) molecule (b) ion
(c) electron (d) atom
12
86Q. 1 Which of the following conditions favours the existence of a substance in
the solid state?
(a) High temperature
(b) Low temperature
(c) High thermal energy
(d) Weak cohesive forces
12
87Q17. What is the coordination number in rock salt type structure?
Ano A
12
88Question 14. What is the two dimensional coordination number of a
molecule in square close packed layer?
MO
12
89Question 18. Non-stoichiometric cuprou
in laboratory. In this oxide, copper to oxy
Can you account for the fact that
semiconductor?
Non-stoichiometric cuprous oxide, Cu20 can be prepared
alory. In this oxide, copper to oxygen ratio is slightly less than 2:1
ccount for the fact that this substance is a p-type
12
90Q. 11 Which of the following is not the characteristic of ionic solids?
(a) Very low value of electrical conductivity in the molten state
(b) Brittle nature
(c) Very strong forces of interactions
(d) Anisotropic nature
12
9113. Which of the statements about glass are correct?
1. Glass is a super-cooled liquid having infinite viscosity
2 Violet coloured glass is obtained by adding Mno,
3. Glass is a man-made silicate.
4. Glass is a crystalline substance.
Select the correct answer using the codes given below.
(a) 1,2 and 4
(b) 2,3 and 4
(c) 1,2 and 3
(d) 1 and 3
12
92les in
……..
0.17 Cations are present in the interstitial sites in
(a) Frenkel defect
(b) Schottky defect
(c) vacancy defect
(d) metal deficiency defect
ns. (a) When smaller inn (usually notinn
12
93Question 2. Why are solids incompressible?12
94Question 12. Distinguish between
(i) hexagonal and monoclinic unit cells.
(ii) face-centred and end-centred unit cells.
12
95Soli
2. 26 In which of the to
ns and Ant
in which of the following structures coordination number for cations and
anions in the packed structure will be same? –
a) Clions form foc lattice and Nations occupy all octahedral voids of the unit co
(b) Ca’t ions form foc lattice and F ions occupy all the eight tetrahedral voids of
the unit cell
(C) O2 ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids :
the unit cell
(d) S2- ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the
unit cell
12
96Q.9 Which of the following is a network solid?
(a) SO2 (solid)
(6) I₂
(c) Diamond
(d) H20 (ice)
12
97Question 10. Give the significance of a ‘lattice point’.
Solution The lattice point denotes the position of a parti
12
98Q. 54 Why are liquids and gases categorised as fluids?12
99Q. 56 Inspite of long range order in the arrangement of particles why are the
crystals usually not perfect?


a
t an
vanaamant
notitiantarticle
in
12
100Question 16. A compound is formed by two elements M and N. The
element N forms ccp and atoms of M occupy rd of tetrahedral voids.
What is the formula of the compound?
12
101Q. 35 In the cubic close packing, the unit cell has ……..
(a) 4 tetrahedral voids each of which is shared by four adjacent unit cells
(b) 4 tetrahedral voids within the unit cell
(c) 8 tetrahedral voids each of which is shared by four adjacent unit cells
(d) 8 tetrahedral voids within the unit cells
wollhae A tetrahedral voids within it and are le
12
1020.55 Why are solids incompressible?12
103Question 13. Niobium crystallises in body-centred cubic structure. If
density is 8.55 g cm . Calculate atomic radius of niobium using its atomic
mass 93 u.
12
104Q. 32 A ferromagnetic substance becomes a permanent magnet when it is
placed in a magnetic field because ……….
(a) all the domains get oriented in the direction of magnetic field
(b) all the domains get oriented in the direction opposite to the direction of
magnetic field
(c) domains get oriented randomly
(d) domains are not affected by magnetic field
12
105Q20. What happens when a ferromagnetic substance is subjected to high temperature?12
106and become
ting and remain
Q. 48 Which of the following statements are correct?
(a) Ferrimagnetic substances lose ferrimagnetism on heating and be
paramagnetic
(b) Ferrimagnetic substances do not lose ferrimagnetism on heating and re
ferrimagnetic
(c) Antiferromagnetic substances have domain structures similar to ferroma
substances and their magnetic moments are not cancelled by each other
(d) In ferromagnetic substances, all the domains get oriented in the directie
magnetic field and remain as such even after removing magnetic field
ferromagnetic
e direction of
12
107Q. 8 Iodine molecules are held in the crystals lattice by ……..
(a) London forces
(b) dipole-dipole interactions
(c) covalent bonds
(d) coulombic forces
12
108Mustration 2.83 Explain why the melting point of a
substance gives an indication of the purity of a substance.
12
109Question 3. Inspite of long range order in the arrangement of particles
why are the crystals usually not perfect?
12

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