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Gold Number

Colloidal sol...

Question

Colloidal solution of gold prepared by different methods are of different colours due to :

A

different size of Au sol particles

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B

variable valence of Au

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C

different concentration of Au sol particles

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D

presence of impurities involved in different methods

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Solution

The correct option is C different size of Au sol particles
Colloidal solutions of gold prepared by different methods are of different colours because of different diameters of colloidal gold particles. The colour of colloidal solutions depends upon the size of the colloidal particles.

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