NCERT Solutions for Class 12 Chemistry Chapter 1 The Solid State Hindi Medium
FAQs on NCERT Solutions for Class 12 Chemistry In Hindi Chapter 1 The Solid State Hindi Medium
1. What is the correct stepwise approach to solve crystal structure questions in Class 12 Chemistry NCERT Solutions for Chapter 1?
To solve crystal structure problems, follow these steps:
- Identify the type of unit cell (simple cubic, body-centered, face-centered)
- Use relevant formulae to relate atomic radius and unit cell edge length
- Calculate number of atoms per unit cell using the unit cell type
- Apply the density formula (d = Z*M/a3*NA) for given parameters
- Check final values for consistency with expected properties
2. How does the stepwise method in NCERT Solutions improve understanding for The Solid State chapter?
Using a stepwise approach breaks down complex problems into manageable parts, making it easier to understand concepts like lattice structures, coordination numbers, and packing efficiency. This method also helps in avoiding errors and reinforces logical problem-solving, important for exam success.
3. Which formulas from Chapter 1 of Class 12 Chemistry are frequently applied in NCERT Solutions, and when should each be used?
Key formulas to remember are:
- a = 2r for simple cubic unit cell
- a = 4r/√3 for body-centered cubic (BCC) cells
- a = 2√2 r for face-centered cubic (FCC) cells
- d = Z*M/a3*NA for density
- Packing efficiency = [Volume occupied by atoms / Volume of unit cell] × 100
4. What common mistakes should students avoid when solving The Solid State problems with NCERT Solutions?
Common errors to avoid include:
- Incorrect identification of unit cell type
- Not using the correct value for Z (number of atoms per unit cell)
- Forgetting unit conversions between pm, nm, and cm
- Skipping steps, which can result in calculation or conceptual mistakes
- Misapplication of formulae specific to FCC, BCC, or simple cubic cells
5. Why is it important to use NCERT Solutions for Class 12 Chemistry Chapter 1, as per the CBSE 2025–26 syllabus?
NCERT Solutions strictly follow the CBSE-approved syllabus and exam patterns, ensuring all concepts taught are relevant, accurate, and expected in board exams. They also prepare students for competitive exams like JEE and NEET by emphasizing stepwise CBSE methodology.
6. What is the significance of coordination number in NCERT exercise solutions, and how do you find it?
The coordination number indicates the number of nearest neighboring particles surrounding a particle in a crystal structure. For example, it is 6 in simple cubic, 8 in body-centered cubic, and 12 in face-centered cubic cells. In solutions, first identify the unit cell type, then directly apply these standard values.
7. How can NCERT Solutions for The Solid State help identify which type of solid (ionic, molecular, covalent, metallic, amorphous) is being described in an exercise question?
Stepwise NCERT Solutions guide students to look for properties:
- Ionic solids: Hard, high melting, conductive in molten state
- Molecular solids: Soft, low melting
- Covalent solids: Rigid, hard, often non-conductors (except graphite)
- Metallic solids: Good conductors, ductile, malleable
- Amorphous solids: No sharp melting point, irregular arrangement
8. How should calculation-based NCERT Solutions use the density formula for unit cells in The Solid State questions?
To calculate density, use the formula: d = Z*M / a3 * NA, where:
- Z = number of atoms per unit cell
- M = molar mass
- a = edge length (in cm)
- NA = Avogadro's number
9. What is packing efficiency, and how is it calculated in NCERT Solutions for Class 12 Chemistry Chapter 1?
Packing efficiency measures how much space in a crystal structure is actually filled by the particles. It is calculated as [Volume of particles in the unit cell/Volume of unit cell] × 100. For FCC, it is 74%; for BCC, 68%; for simple cubic, 52.4%. Use these values directly after determining the cell type.
10. What should a student do if a question in The Solid State Chapter involves a unit cell containing more than one kind of atom (compound structures)?
When faced with mixed structures:
- Identify the position and type of each atom (corners, face centers, edge centers, or body center)
- Calculate the number of each atom present in one unit cell using position-sharing rules
- Write the formula based on the atom count ratio
11. What is the role of stepwise reasoning in answering assertion-reason or conceptual questions in the NCERT Solutions for The Solid State?
Stepwise reasoning helps clearly connect each concept, explaining not just what the answer is but also why it is correct. This structured justification is key to scoring marks in CBSE assertion-reason questions and builds strong conceptual understanding.
12. How do NCERT Solutions for Class 12 Chemistry Chapter 1 help in learning about defects in crystals, like Schottky and Frenkel defects?
NCERT Solutions explain defects using a structured, stepwise comparison:
- Schottky defect: Equal numbers of cations and anions missing, reducing density
- Frenkel defect: Anion or cation leaves normal site for an interstitial site, density unchanged
13. Why is following CBSE-prescribed nomenclature and methodology essential in The Solid State NCERT Solutions?
CBSE marking schemes reward the use of correct terms, notation, and solution processes as specified in NCERT. Using prescribed nomenclature and layout ensures answers are easily verifiable and score maximum marks, avoiding penalties for informal wording.
14. What strategies can be used to double-check answers in stepwise NCERT Solutions for The Solid State?
Effective strategies include:
- Re-reading each calculation step and conversion
- Verifying formula application matches the unit cell type
- Cross-referencing summary tables in the textbook
- Comparing with solved examples in the NCERT
15. If a concept from The Solid State feels unclear, how should a student revisit NCERT Solutions to clarify it?
If you find a topic confusing, first review the stepwise explanation in the NCERT Solution. Then, rework the steps independently, consult diagrams, and refer to the related section in the textbook. This reinforces learning and develops problem-solving skills for board exam scenarios.

















