Question

Which of the following is an example of associated colloid?
a.) Protein + water
b.) Soap + Water
c.) Rubber + benzene
d.) ${ As }_{ 2 }{ O }_{ 3 }{ +Fe(OH) }_{ 3 }$

Answer 1

Hint: Associated colloids: A few substances at low concentration carry on as normal electrolytes, however at higher concentrations show colloidal conduct because of the development of aggregates. The aggregated particles are called micelles and are otherwise called associated colloids.

Complete step by step solution:
Protein + water: It is a colloidal solution. A colloid is a kind of synthetic mixture where one substance is scattered equitably all through another. The particles of the scattered substance are just suspended in the mixture, in contrast to an answer, where they are totally dissolved inside.

Soap + Water: The colloidal solution of soap and water is an example of associated colloid. Associated colloids are small-scale heterogeneous frameworks in which the particles of the colloidal scattered stage (micelles) are shaped by the agglomeration of atoms or particles of the substance disintegrated in the scattering medium.

Rubber + benzene: It is an example of macromolecular colloids. Certain substances structure enormous atoms whose measurements are similar to those of colloidal particles. Such atoms have high sub-atomic masses and are named as macromolecules. At the point when such substances are scattered in a reasonable scattering medium, the subsequent colloidal arrangements are known as macromolecular colloids.

${ As }_{ 2 }{ O }_{ 3 }{ +Fe(OH) }_{ 3 }$: On mixing ${ Fe(OH) }_{ 3 }$ (positive sol) and ${ As }_{ 2 }{ O }_{ 3 }$ (negative sol), mutual coagulation occurs which causes precipitation. In this reaction, no new compound is formed.
Hence, the correct option is B.

Note: The possibility to make a mistake is that you may choose option A. Protein in water is also a mixture of a colloidal solution but not an example of an associated colloid.