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Coagulation

Colloidal sol...

Question

Colloidal solutions of gold prepared by different methods are of different colors due to _______.

A

Variable valency of gold

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B

Different sizes of gold particles

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C

Different concentrations of gold particles

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D

Presence of impurities produced by different methods

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Solution

The correct option is B
Different sizes of gold particles

Explanation:
A colloidal solution is a solution in which a substance is evenly suspended in a liquid.
The color of colloidal solutions depends upon the size of the colloidal particles.
So, the colloidal solutions of gold are of different colors because of the different sizes of colloidal gold particles.
Hence, the correct option is (B). Colloidal solutions of gold prepared by different methods are of different colors due to the different sizes of gold particles.

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