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.
- 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.
- 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.
- It is a mixture of two or more metals, and small amount of non – metals also.
- These are minerals from which metals are produced.
- 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.
Application Form Submission 16 Dec 2020 to 16 Jan 2021.