The electrical charge on a colloidal particle is observed by:

Solution

The electrical change on a colloidal particle is observed by electrophoresis. Under electric field, charged particles move in a particular direction.

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is : –

According to Freundlich adsorption isotherm which of the following is correct?

Gold numbers of protective colloids A, B, C and Dare 0.50,0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is

Metals like Pt and Pd can adsorb large volume of hydrogen under specific conditions. Such adsorbed hydrogen by the metal is known as

Which one is an example of multi molecular colloid system

Solution

Example of multi molecular colloid system is a gold dispersed in water.

Bredig arc method cannot be used to prepare colloidal solution of which of the following

Solution

Bredig’s arc method is suitable for the preparation of colloidal solution of metals like gold, silver, platinum etc. An arc is struck between the metal electrode under the surface of water containing some stabilzing agent such as a trace of KOH. However, Fe does not react with alkalies that is why it is not obtained by Bredig’s-arc method.

Purple of cassius is colloidal solution of :

The efficiency of an enzyme in catalysing a reaction is due to its capacity

Solution

Efficiency of catalysing property of a catalyst is inversely proportional to activation energy.

The charge on colloidal particles is due to

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