Question:

A lyophobic colloid cannot be formed by

Updated On: Jul 5, 2022
  • mixing dispersed phase and dispersion medium
  • chemical reactions like hydrolysis
  • exchange of solvent
  • peptisation.
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The Correct Option is A

Solution and Explanation

In Lyophobic sols, substances like metals, their sulphides, etc., when simply mixed with the dispersion medium do not form the colloidal sol. These colloidal sols need a special method for their preparation. When the Dispersed phase and dispersion medium are mixed simply the colloidal sol can't be formed. Hence, they are called irreversbile sols.
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Notes on Surface Chemistry

Concepts Used:

Surface Chemistry

The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc. 

Read Also: Surface Chemistry

Applications of surface chemistry are:

Adsorption:

The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal

Two types of adsorption are:-

  • Chemisorption: It is also known as Chemical Adsorption.
  • Physisorption: It is also known as Physical Adsorption.

Corrosion:

The process through which the refined metals convert themselves into more stable compounds is known as corrosion.

Crystallisation:

The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.

Heterogeneous Catalysis:

The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state. 

There are two types of catalysis:-

  • When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
  • When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.