Colloidal solution of gold prepared by different methods have different colours, because

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Variable valencies of gold

Difference in the concentration of gold particles

Impurities produced by different methods

Difference in the diameter of colloidal gold particles

answer is D.

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Detailed Solution

A colloidal solution is a mixture of dispersed phase (solute) and dispersed medium (solvent) in which the particle size ranges between 1 nm to 1000 nm. The color of colloidal solution depends upon the size of solute particles.

Thus, colloidal solutions of gold prepared by different methods have different colors, because of the difference in the diameter of colloidal gold particles.

Hence, option (D) is correct.

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