(A) The colour of colloidal solutions depends on the wavelength of light scattered by the dispersed particles. This wavelength further depends on the

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The difference in the size of the colloidal particles

(A) The colour of colloidal solutions depends on the wavelength of light scattered by the dispersed particles. This wavelength further depends on the size and nature of the particles. In the case of gold sol,the size of the colloidal particles varies depending on the method of preparation,which leads to the scattering of different wavelengths of light,resulting in different colours.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

Difficult

Colloidal solutions of gold prepared by different methods have different colours owing to

A
The difference in the size of the colloidal particles
B
The fact that gold exhibits a variable valency of $+1$ and $+3$
C
Different concentrations of gold
D
Presence of different types of foreign particles depending upon the method of preparation of the colloid