Chemistry Revision Notes for Class 12 Chapter 1 the Solid State

Chapter 1 The Solid State talks about two main categories of solids which are, Crystalline solids and amorphous solids. Before understanding the differences between these solids, let us learn their characteristic properties.

  • They have a definite shape, volume, and mass
  • Their constituent particles have fixed positions and can only oscillate about their mean positions
  • Intermolecular distances are short
  • They are incompressible and rigid
  • Intermolecular forces are strong

Crystalline solids have definite geometrical shape and are true solids. These solids are anisotropic in nature and have long-range order.

  • Ionic solids
  • Molecular solids
  • Covalent-network solids
  • Metallic solids

CBSE Class 12 Chemistry Chapter 1 The Solid State

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Frequently asked Questions on CBSE Class 12 Chemistry Notes Chapter 1: The Solid State

What are ‘Crystalline solids’?

Crystalline solids are solids whose constituents are arranged in a highly ordered microscopic structure forming a crystal lattice.

What is a ‘Unit cell’?

A unit cell is the smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire crystal.

What is ‘Packing Efficiency’?

The packing efficiency is the fraction of the crystal/unit cell actually occupied by the atoms.

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