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How are colloidal solutions of gold prepared by different colours?

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in Chemistry – Class 12 by (188k points)
How are colloidal solutions of gold prepared by different colours?

(a) Different diameters of colloidal gold particles

(b) Variable valency of gold

(c) Different concentration of gold particles

(d) Impurities produced by different methods

The question was asked by my school principal while I was bunking the class.

Asked question is from Surface Chemistry in division Surface Chemistry of Chemistry – Class 12

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Right option is (a) Different diameters of colloidal gold particles

To explain I would say: 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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