Solid State
Maharashtra Board · Class 12 · Chemistry
Quick revision notes for Solid State — Maharashtra Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Classification of Solids
- Solids are classified into two main types: Crystalline solids (regular arrangement) and Amorphous solids (irregular arrangement)
- Crystalline solids have sharp melting points, are anisotropic (except cubic), and show long-range order
- Amorphous solids soften gradually over temperature range, are isotropic, and have short-range order only
Crystal Lattices and Unit Cells
- Crystal = Lattice + Basis (constituent particles attached to lattice points)
- Four types of unit cells: Primitive (simple), Body-centered, Face-centered, Base-centered
- Seven crystal systems based on unit cell parameters (a, b, c) and angles (α, β, γ)
Close Packing and Coordination
- Close packing maximizes space utilization and intermolecular attractions
- 1D packing: spheres in contact in a row
- 2D packing: Square (AAAA, coordination = 4) and Hexagonal (ABAB, coordination = 6)
Crystal Defects
- Point defects: irregularities at specific lattice points
- Stoichiometric defects: Vacancy, Self-interstitial, Schottky, Frenkel
- Vacancy defect: missing atoms, decreases density
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Solid State covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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