CBSE Class 12 Chemistry Solid State Assignment Set 01

Welcome! Check out the CBSE Class 12 Chemistry Solid State Assignment Set 01 built for the 2026-27 academic term. Get complete Class 12 Chemistry school assignments featuring key solved questions and answers for Unit 1 Solid State. Experienced teachers have designed these sheets following official guidelines from NCERT, CBSE, and KVS.

Practice Assignment: Class 12 Chemistry Unit 1 Solid State

Check out these Class 12 Chemistry problems for daily practice to boost your school exam results. Designed as an ideal assessment tool for Unit 1 Solid State, these printable assignment sheets mix basic questions with advanced problems to secure your success.

Unit 1 Solid State Class 12 Solved Questions and Answers

Level-1 QUESTIONS
 
1 Why are solids rigid?
 
Because the particles have fixed positions and can oscillate only about their mean position only.
 
2 Why do solids have a definite volume?
 
The particles of solid have fixed positions and can oscillate only about their mean positions only. That is, solids possess rigidity and hence have definite volume.
 
3 Why is glass considered a super cooled liquid?
 
Like liquids, amorphous solids have a tendency to flow, though very slowly.
 
4 Give the significance of a ‘lattice point’.
 
It is the constituent particle (atom, ion or molecule) of a regular and repeating pattern of crystalline solid
 
5 Name the parameters that characterise a unit cell.
 
A unit cell is characterised by:
 
(i) its dimensions along the three edges, a, b and c. These edges may or may not be mutually perpendicular.
 
(ii) angles between the edges, α (between b and c) β (between a and c) and γ (between a and b).
Thus, a unit cell is characterised by six parameters, a, b, c, α, β and γ. These parameters of a typical unit cell are shown in the fig.
 
6. Distinguish between Face- centred and end-centred unit cells and body - centred unit cells. A face centered unit cell has one constituent particle present at the centre of each face in addition to corner particles. An end centered unit cell has one particle each at the centre of any two opposite faces in addition to corner particles. A body centered unit cell has one particle at the centre of unit cell in addition to corner particles.
 
7 What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr ZnS shows Frenkel defect due to large difference in ionic size. AgBr shows both Frenkel defect and Schottky defect

8. Define the term 'amorphous'. Give a few examples of amorphous solids.

An amorphous solid consists of particles of irregular shape. The arrangement of constituent particles

(atoms, molecules or ions) in such a solid has only short range order. Glass, rubber and plastics are typical examples of amorphous solids. 9
 
(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?

(i) The number of immediate neighbouring atoms with which each atom is in contact with is known as co-ordination number.

(ii) a) in a cubic close-packed structure the coordination number is 12

b) in a body-centred cubic structure the coordination number is 8

10 How will you distinguish between the following pairs of terms?

(i) Crystal lattice and unit cell?

(ii) Tetrahedral void and octahedral void?

(i) a regular three dimensional arrangement of points in space is called a crystal lattice. Unit cell is the smallest portion of a crystal lattice which, when repeated in different directions, generates the entire lattice. (ii

Tetrahedral void Octahedral void

1.it is a void formed when 4 spheres

(3 in one layer and 1 in next layer) are joined together.

2. Its co-ordination number is 4.

3.its radius is 0.225R where R is the radius of the close packed sphere

4. Tetrahedral void is much smaller than

octahedral void

1.it is a void formed when 6 spheres

(3 in one layer and 3 in next layer) are joined together.

2. Its co-ordination number is 6.

3.its radius is 0.414R where R is the radius of the close packed sphere

4. Octahedral void is much bigger than tetrahedral void.

11. What is a semiconductor? Describe the two main types of semiconductors and contrast their conduction mechanism.
These are the solids with conductivities in the intermediate range of conductors and insulators (from 10–6 to 104 ohm–1m–1)
 
Important Questions for NCERT Class 12 Chemistry Solid State
 

Question. The fcc crystal contains how many atoms in each unit cell?
(a) 6
(b) 8
(c) 4
(d) 5.

Answer :  C

Question. The number of atoms contained in a fcc unit cell of a monatomic substance is
(a) 1
(b) 2
(c) 4
(d) 6

Answer :  C

Question. The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
(a) allotropic crystals
(b) liquid crystals
(c) isomeric crystals
(d) isomorphous crystals.

Answer :  B

Question. Glass is a
(a) liquid
(b) solid
(c) supercooled liquid
(d) transparent organic polymer.

Answer :  C

Question. Most crystals show good cleavage because their atoms, ions or molecules are
(a) weakly bonded together
(b) strongly bonded together
(c) spherically symmetrical
(d) arranged in planes. 

Answer :  D

Question. The ability of a substance to assume two or more crystalline structures is called
(a) isomerism
(b) polymorphism
(c) isomorphism
(d) amorphism

Answer :  B

Question. Cation and anion combines in a crystal to form following type of compound
(a) ionic
(b) metallic
(c) covalent
(d) dipole-dipole. 

Answer :  A

Question. For two ionic solids CaO and KI, identify the wrong statement among the following.
(a) CaO has high melting point.
(b) Lattice energy of CaO is much larger than that of KI.
(c) KI has high melting point.
(d) KI is soluble in benzene

Answer :  D

Question. For orthorhombic system axial ratios are a ≠ b ≠ c and the axial angles are
(a) α = β = γ ≠ 90º
(b) α = β = γ = 90º
(c) α = γ = 90º, β ≠ 90º
(d) α ≠ β ≠ γ ≠ 90º

Answer :  B

Question. The number of carbon atoms per unit cell of diamond unit cell is
(a) 6
(b) 1
(c) 4
(d) 8 

Answer :  D

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Unit 1 Solid State Printable Assignments & Solutions for Class 12 Chemistry

Class 12 Chemistry Unit 1 Solid State Printable Assignments

Access the latest Unit 1 Solid State assignments designed as per the current CBSE syllabus for Class 12. We have included all question types, including MCQs, short answer questions, and long-form problems relating to Unit 1 Solid State. You can easily download these assignments in PDF format for free. Our expert teachers have carefully looked at previous year exam patterns and have made sure that these questions help you prepare properly for your upcoming school tests.

Key Advantages of Solving Unit 1 Solid State Assignments

  • Higher Performance: Master Unit 1 Solid State thoroughly through steady practice to answer all examination prompts correctly.
  • Pattern Alignment: Designed in strict accordance with modern CBSE sample papers and grading schemes.
  • Multi-Format Practice: Includes Case Studies, objective drills, and varied descriptive problems with solutions for Unit 1 Solid State.
  • Speed Enhancement: Working through Unit 1 Solid State question papers daily optimizes time management skills.

How to Approach Chemistry Unit 1 Solid State Assignments

  1. Initial Reading: Begin by reading the NCERT book for Class 12 Chemistry to build a baseline understanding.
  2. Independent Testing: Attempt the Unit 1 Solid State questions unassisted, then verify your work using our provided answer keys.
  3. Supplementary Aids: Leverage our Revision Notes and Class 12 worksheets to clarify complicated sections.
  4. Mistake Management: Keep a log of tricky points and review them regularly through online MCQ practice.

Tips for Successful Class 12 Chemistry Studies

For maximum performance, make it a habit to solve one assignment for Unit 1 Solid State daily. Incorporating a stopwatch during practice builds strong time-management reflexes required for official CBSE evaluations.

FAQs

Where can I download the latest CBSE Class 12 Chemistry Unit 1 Solid State assignments?

You can download free PDF assignments for Class 12 Chemistry Unit 1 Solid State from StudiesToday.com. These practice sheets have been updated for the 2026-27 session covering all concepts from latest NCERT textbook.

Do these Chemistry Unit 1 Solid State assignments include solved questions?

Yes, our teachers have given solutions for all questions in the Class 12 Chemistry Unit 1 Solid State assignments. This will help you to understand step-by-step methodology to get full marks in school tests and exams.

Are the assignments for Class 12 Chemistry Unit 1 Solid State based on the 2026 exam pattern?

Yes. These assignments are designed as per the latest CBSE syllabus for 2026. We have included huge variety of question formats such as MCQs, Case-study based questions and important diagram-based problems found in Unit 1 Solid State.

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Practicing topicw wise assignments will help Class 12 students understand every sub-topic of Unit 1 Solid State. Daily practice will improve speed, accuracy and answering competency-based questions.

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