Properties of Colloids

General Knowledge » Science »


Properties of Colloids : : Basic Chemistry Atoms and Molecules

Colloids :

Colloidal particles may be crystalline or non – crystalline.
When these are dispersed in a liquid, solid or gas they result in formation of a colloidal system, e.g., top soil of earth, protoplasm etc.

  • Sol : When a solid is dispersed in a liquid. The particles of a sol will not settle out.
  • Gel : In a gel the liquid contains a colloidal solid dispersed throughout the system but set in a structure which does not flow, e.g., gelatin, jellies etc.
  • Aerosol : The dispersion of either a solid or a liquid in a gas. When the dispersed colloidal particle is solid, the result is smoke and when it is liquid, the result is fog.
  • Emulsion : When one liquid is dispersed into another in which it is not soluble e.g., Milk, Paint etc.

Properties of Colloids :

  • When the beam of light is passed through a true solution the path of the beam is not visible but when it is passed through a sol its path is visible.
  • This effect is known as Tyndall Effect.

Metallurgy :

  • It comprises the various processes involved in the production of metal from the ore which generally contains a large percentage of rocky material, called gangue or matrise.

Rusting :

  • It is caused in iron due to presence of moisture, oxygen, CO2 in the air.
  • Rusting is prevented by surface coating with Film of Oil, Paint or Metal Coating such as Chromium Coating, Nickel Plating, Tin Plating and Copper Plating.

Alloy :

  • It is a mixture of two or more metals, and small amount of non – metals also.

Ores :

  • These are minerals from which metals are produced.

Minerals :

  • These are the natural materials extracted from the earth that are formed through Geological Processes.
  • Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms.

General Studies Question Bank CD

JEE Main

Application Form Submission 16 Dec 2020 to 16 Jan 2021.