NCERT Exemplar for Chapter 1 Solid state Chemistry class 12

SimplyAcad has provided the NCERT Exemplar Class 12 Chemistry Chapter 1 below to help students learn about the different topics in a detailed manner. The exemplar will allow students to gain deep insights of all the sections and prepares you better for the upcoming examination. Chemistry is an interesting subject which requires attention to minor details, hence, completing exemplars will be an effective way to increase your marks and boost confidence in you. The given exemplar contains MCQs of two different types and Short Answer Type Questions, there are a total of 60 questions asked. Students can access the NCERT exemplar for class 12 chemistry, Chapter 1: Solid State by scrolling below. Along with this, there are several NCERT exemplar for class 12 science of all the chapters provided on this platform.

Access the NCERT Exemplar Class 12 Chemistry Chapter 1 Solid-State

I. Exemplar Class 12 Chemistry Chapter 1 : Multiple-choice Questions for Class 12 Chemistry Solid State

Question 1

Which of the following conditions favours the existence of a substance in the solid state?

(i) High temperature

(ii) Low temperature

(iii) High thermal energy

(iv) Weak cohesive forces

Solution:

Option (ii) is the answer.

Question 2

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

(i) Definite and characteristic heat of fusion.

(ii) Isotropic nature.

(iii) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.

(iv) A true solid

Solution:

Option (ii) is the answer.

Question 3

Which of the following is an amorphous solid?

(i) Graphite (C)

(ii) Quartz glass (SiO2)

(iii) Chrome alum

(iv) Silicon carbide (SiC)

Solution:

Option (ii) is the answer.

Question 4

Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substances?

Solution:

Option (iv) is the answer.

Question 5

Which of the following is true about the value of the refractive index of quartz glass?

(i) Same in all directions

(ii) Different in different directions

(iii) Cannot be measured

(iv) Always zero

Solution:

Option (i) is the answer

Question 6

Which of the following statement is not true about amorphous solids?

(i) On heating, they may become crystalline at a certain temperature.

(ii) They may become crystalline on keeping for a long time.

(iii) Amorphous solids can be moulded by heating.

(iv) They are anisotropic.

Solution:

Option (iv) is the answer.

Question 7

The sharp melting point of crystalline solids is due to ___________.

(i) a regular arrangement of constituent particles observed over a short distance in the crystal lattice.

(ii) a regular arrangement of constituent particles observed over a long distance in the crystal lattice.

(iii) the same arrangement of constituent particles in different directions.

(iv) a different arrangement of constituent particles in different directions.

Solution:

Option (ii) is the answer.

Question 8

Iodine molecules are held in the crystals lattice by ____________.

(i) London forces

(ii) dipole-dipole interactions

(iii) covalent bonds

(iv) coulombic forces

Solution:

Option (i) is the answer.

Question 9

Which of the following is a network solid?

(i) SO2 (Solid)

(ii) I2

(iii) Diamond

(iv) H2O (Ice)

Solution:

Option (iii) is the answer.

Question 10

Which of the following solids is not an electrical conductor?

(A) Mg (s) (B) TiO (s) (C) I2 (s) (D) H2O (s)

(i) (A) only

(ii) (B) Only

(iii) (C) and (D)

(iv) (B), (C) and (D)

Solution:

Option (iii) is the answer.

Question 11

Which of the following is not characteristic of ionic solids?

(i) A very low value of electrical conductivity in the molten state.

(ii) Brittle nature.

(iii) Very strong forces of interactions.

(iv) Anisotropic nature.

Solution:

Option (i) is the answer.

Question 12

Graphite is a good conductor of electricity due to the presence of __________.

(i) lone pair of electrons

(ii) free valence electrons

(iii) cations

(iv) anions

Solution:

Option (ii) is the answer.

Question 13

Which of the following oxides behaves as a conductor or insulator depending upon temperature?

(i) TiO

(ii) SiO2

(iii) TiO3

(iv) MgO

Solution:

Option (iii) is the answer.

Question 14

Which of the following oxides shows electrical properties like metals?

(i) SiO2

(ii) MgO

(iii) SO2(s)

(iv) CrO2

Solution:

Option (iv) is the answer.

Question 15

The lattice site in a pure crystal cannot be occupied by _________.

(i) molecule

(ii) ion

(iii) electron

(iv) atom

Solution:

Option (iii) is the answer.

Question 16

Graphite cannot be classified as __________.

(i) conducting solid

(ii) network solid

(iii) covalent solid

(iv) ionic solid

Solution:

Option (iv) is the answer.

Question 17

Cations are present in the interstitial sites in __________.

(i) Frenkel defect

(ii) Schottky defect

(iii) Vacancy defect

(iv) Metal deficiency defect

Solution:

Option (i) is the answer.

Question 18

Schottky defect is observed in crystals when __________.

(i) some cations move from their lattice site to interstitial sites.

(ii) the equal number of cations and anions are missing from the lattice.

(iii) some lattice sites are occupied by electrons.

(iv) some impurity is present in the lattice.

Solution:

Option (ii) is the answer.

Question 19

Which of the following is true about the charge acquired by p-type semiconductors?

(i) positive

(ii) neutral

(iii) negative

(iv) depends on the concentration of p impurity

Solution:

Option (ii) is the answer.

Question 20

To get an n-type semiconductor from silicon, it should be doped with a substance with valence__________.

(i) 2

(ii) 1

(iii) 3

(iv) 5

Solution:

Option (iv) is the answer.

Question 21

The total number of tetrahedral voids in the face-centred unit cell is __________.

(i) 6

(ii) 8

(iii) 10

(iv) 12

Solution:

Option (ii) is the answer.

Question 22

Which of the following point defects are shown by AgBr(s) crystals?

(A) Schottky defect (B) Frenkel defect

(C) Metal excess defect (D) Metal deficiency defect

(i) (A) and (B)

(ii) (C) and (D)

(iii) (A) and (C)

(iv) (B) and (D)

Solution:

Option (i) is the answer.

Question 23

In which pair most efficient packing is present?

(i) hcp and bcc

(ii) hcp and ccp

(iii) bcc and up

(iv) bcc and simple cubic cell

Solution:

Option (ii) is the answer.

Question 24

The percentage of empty space in a body-centred cubic arrangement is ________.

(i) 74

(ii) 68

(iii) 32

(iv) 26

Solution:

Option (iii) is the answer.

Question 25

Which of the following statement is not true about the hexagonal close packing?

(i) The coordination number is 12.

(ii) It has 74% packing efficiency.

(iii) Tetrahedral voids of the second layer are covered by the spheres of the third layer.

(iv) In this arrangement, spheres of the fourth layer are exactly aligned with those of the first layer.

Solution:

Option (iv) is the answer.

Question 26

In which of the following structures coordination number for cations and anions in the packed structure will be the same?

(i) Cl–ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.

(ii) Ca2+ ions form fcc lattice and F- ions occupy all the eight tetrahedral voids of the unit cell.

(iii) O2– ions form fcc lattice and Na+ions occupy all the eight tetrahedral voids of the unit cell.

(iv) S2– ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.

Solution:

Option (i) is the answer.

Question 27

What is the coordination number in a square close-packed structure in two dimensions?

(i) 2

(ii) 3

(iii) 4

(iv) 6

Solution:

Option (iii) is the answer.

Question 28

Which kind of defects are introduced by doping?

(i) Dislocation defect

(ii) Schottky defect

(iii) Frenkel defects

(iv) Electronic defects

Solution:

Option (iv) is the answer.

Question 29

Silicon doped with electron-rich impurity forms ________.

(i) p-type semiconductor

(ii) n-type semiconductor

(iii) intrinsic semiconductor

(iv) insulator

Solution:

Option (ii) is the answer.

Question 30

Which of the following statements is not true?

(i) Paramagnetic substances are weakly attracted by the magnetic field.

(ii) Ferromagnetic substances cannot be magnetised permanently.

(iii) The domains in antiferromagnetic substances are oppositely oriented with respect to each other.

(iv) The pairing of electrons cancels their magnetic moment in the diamagnetic substances.

Solution:

Option (ii) is the answer.

Question 31

Which of the following is not true about ionic solids?

(i) Bigger ions form the close-packed structure.

(ii) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.

(iii) Occupation of all the voids is not necessary.

(iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids.

Solution:

Option (iv) is the answer.

Question 32

A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ________.

(i) all the domains get oriented in the direction of the magnetic field.

(ii) all the domains get oriented in the direction opposite to the direction of the magnetic field.

(iii) domains get oriented randomly.

(iv) domains are not affected by the magnetic field.

Solution:

Option (i) is the answer.

Question 33

The correct order of the packing efficiency in different types of unit cells is ________.

(i) fcc < bcc < simple cubic

(ii) fcc > bcc > simple cubic

(iii) fcc < bcc > simple cubic

(iv) bcc < fcc > simple cubic

Solution:

Option (ii) is the answer.

Question 34

Which of the following defects is also known as dislocation defect?

(i) Frenkel defect

(ii) Schottky defect

(iii) Non-stoichiometric defect

(iv) Simple interstitial defect

Solution:

Option (i) is the answer.

Question 35

In the cubic close packing, the unit cell has ________.

(i) 4 tetrahedral voids, each of which is shared by four adjacent unit cells.

(ii) 4 tetrahedral voids within the unit cell.

(iii) 8 tetrahedral voids, each of them which is shared by four adjacent unit cells.

(iv) 8 tetrahedral voids within the unit cells.

Solution:

Option (iv) is the answer.

Question 36

The edge lengths of the unit cells in terms of the radius of spheres constituting fcc, bcc and simple cubic unit cell are respectively________

(i) 2√2r, 4r/√3, 2r

(ii) 4r/√3, 2√2r, 2r

(iii) 2r, 2√2r, 4r/√3

(iv) 2r, 4r/√3, 2√2r

Solution:

Option (i) is the answer.

Question 37

Which of the following represents the correct order of conductivity in solids?

(i) κ metals >> κ insulators < κ semiconductors

(ii) κ metals << κ insulators < κ semiconductors

(iii) κ metals > κ semiconductors > κ insulators = zero

(iv) κ metals < κ semiconductors > κ insulators ≠ zero

Solution:

Option (i) is the answer.

II. Exemplar Class 12 Chemistry Chapter 1 : Solid state chemistry class 12 : Multiple Choice Questions (Type-II)

Note: In the following questions, two or more options may be correct.

Question 38

Which of the following is not true about the voids formed in 3-dimensional hexagonal close-packed structure?

(i) A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the first layer.

(ii) All the triangular voids are not covered by the spheres of the second layer.

(iii) 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.

(iv) Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar voids in the first layer.

Solution:

Option (iii) and (iv) are the answers.

Question 39

The value of the magnetic moment is zero in the case of antiferromagnetic substances because the domains ________.

(i) get oriented in the direction of the applied magnetic field.

(ii) get oriented opposite to the direction of the applied magnetic field.

(iii) are oppositely oriented with respect to each other without the application of the magnetic field.

(iv) cancel out each other’s magnetic moment.

Solution:

Option (iii) and (iv) are the answers.

Question 40

Which of the following statements is not true?

(i) Vacancy defect results in a decrease in the density of the substance.

(ii) Interstitial defects increase the density of the substance.

(iii) Impurity defect does not affect the density of the substance.

(iv) Frankel defect results in an increase in the density of the substance.

Solution:

Option (iii) and (iv) are the answers.

Question 41

Which of the following statements are true about metals?

(i) Valence band overlaps with the conduction band.

(ii) The gap between the valence band and the conduction band is negligible.

(iii) The gap between the valence band and the conduction band cannot be determined.

(iv) Valence band may remain partially filled.

Solution:

Option (i), (ii) and (iv) are the answers.

Question 42

Under the influence of the electric field, which of the following statements is true about the movement of electrons and holes in a p-type semiconductor?

(i) The electron will move towards the positively charged plate through the electron holes.

(ii) Holes will appear to be moving towards the negatively charged plate.

(iii) Both electrons and holes appear to move towards the positively charged plate.

(iv) Movement of electrons is not related to the movement of holes.

Solution:

Option (i) and (ii) are the answers.

Question 43

Which of the following statements about semiconductors are true?

(i) Silicon doped with an electron-rich impurity is a p-type semiconductor.

(ii) Silicon doped with an electron-rich impurity is an n-type semiconductor.

(iii) Delocalised electrons increase the conductivity of doped silicon.

(iv) An electron vacancy increases the conductivity of the n-type semiconductor.

Solution:

Option (ii) and (iii) are the answers.

Question 44

An excess of potassium ions makes KCl crystals appear violet or lilac in colour since ________.

(i) some of the anionic sites are occupied by an unpaired electron.

(ii) some of the anionic sites are occupied by a pair of electrons.

(iii) there are vacancies at some anionic sites.

(iv) F-centres are created, which impart colour to the crystals.

Solution:

Option (i) and (iv) are the answers.

Question 45

The number of tetrahedral voids per unit cell in NaCl crystal is ________.

(i) 4

(ii) 8

(iii) twice the number of octahedral voids.

(iv) four times the number of octahedral voids.

Solution:

Option (ii) and (iii) are the answers.

Question 46

Amorphous solid can also be called ________.

(i) pseudo solids

(ii) true solids

(iii) supercooled liquids

(iv) supercooled solids

Solution:

Option (i) and (iii) are the answers.

Question 47

A perfect crystal of silicon (Fig. 1.1) is doped with some elements as given in the options. Which of these options shows n-type semiconductors?

Solution:

Option (i) and (iii) are the answers.

Question 48

Which of the following statements is correct?

(i) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic.

(ii) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic.

(iii) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other.

(iv) In ferromagnetic substances, all the domains get oriented in the direction of the magnetic field and remain as such even after removing the magnetic field.

Solution:

Option (i) and (iv) are the answers.

Question 49

Which of the following features are not shown by quartz glass?

(i) This is a crystalline solid.

(ii) Refractive index is the same in all directions.

(iii) This has a definite heat of fusion.

(iv) This is also called supercooled liquid.

Solution:

Option (i) and (iii) are the answers.

Question 50

Which of the following cannot be regarded as a molecular solid?

(i) SiC (Silicon carbide)

(ii) AlN

(iii) Diamond

(iv) I2

Solution:

Option (i), (ii) and (iii) are the answers.

Question 51

In which of the following arrangements are octahedral voids formed?

(i) hcp

(ii) bcc

(iii) simple cubic

(iv) fcc

Solution:

Option (i) and (iv) are the answers.

Question 52

Frenkel defect is also known as ________.

(i) stoichiometric defect

(ii) dislocation defect

(iii) impurity defect

(iv) non-stoichiometric defect

Solution:

Option (i) and (ii) are the answers.

Question 53

Which of the following defects decreases the density?

(i) Interstitial defect

(ii) Vacancy defect

(iii) Frankel defect

(iv) Schottky defect

Solution:

Option (ii) and (iv) are the answers.

III. Exemplar Class 12 Chemistry Chapter 1 : Short Answer Type for Class 12 Chemistry Solid State

Question 54

Why are liquids and gases categorised as fluids?

Solution:

They both have the property to flow. The molecules of liquid and gas can move fast from one to another. That is why they are categorized as fluids.

Question 55

Why are solids incompressible?

Solution:

Solids are incompressible because their intermolecular distance between the molecules is very less. There will be a large repulsive force between the electron clouds.

Question 56

Despite long-range order in the arrangement of particles, why are the crystals usually not perfect?

Solution:

The crystallization process will be faster, so the particle may not get enough time to arrange in perfect order. That is why crystals have a long-range arrangement of particles but are not perfect.

Question 57

Why does table salt, NaCl, sometimes appear yellow?

Solution:

This is due to the metal excess defect. The unpaired electrons get trapped in anion vacancies. When the electrons absorb energy, it gets excited and falls on the crystals. Thus the colour becomes yellow.

Question 58

Why is FeO (s) not formed in stoichiometric composition?

Solution:

The composition of Fe2+ and O2 ions is not 1:1 it is 0.95:1. This can be obtained if and only if a small number of Fe2+ ions are replaced by two-thirds of Fe3+ in OH sites.

Question 59

Why does white ZnO (s) become yellow upon heating?

Solution:

When ZnO is heated, it gives Zn2+ electrons. The excess Zn ions get trapped in the interstitial site and vacant sites, also. The yellow colour is due to this electron and electrical conductivity in crystals.

Question 60

Why does the electrical conductivity of semiconductors increase with a rise in temperature?

Solution:

The energy gap between the valence band and conduction band is small. At room temperature, they do not conduct electricity but raise the electrons to get enough energy to excite from the valence band to the conduction band. This is called thermodynamic conduction in intrinsic semiconductors.

Exemplars For Class 12 Science

The NCERT exemplars are an effective study material for scoring higher marks in the examination paper. Students must practise these additional questions for their own benefits, as these are curated by the best subject-matter experts to boost both knowledge and confidence. Students can easily access the ncert exemplar for class 12 science by visiting our website SimplyAcad and solve all the questions listed to secure maximum marks.

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