Question:

Gold number is associated with

Updated On: Jun 7, 2022
  • amount of gold
  • protective colloids
  • purple of cassius
  • electrophoresis.
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The Correct Option is B

Solution and Explanation

To avoid the precipitation of lyophobic sol. by the addition of electrolyte, some lyophilic colloid is added to it. Such lyophilic colloid is called protective colloid and the action of lyophilic colloid by the electrolytes is known as protective anion. Gold Number Of a protective colloid is a minimum weight of it milligram which must be added to 10ml of a standard red gold sol so that no coagulation of the gold sol.
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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.