A) variable valency of gold
B) different concentration of gold particles
C) impurities produced by different methods
D) different diameters of colloidal gold particles
Correct Answer: D
Solution :
Colloidal solution of gold prepared by different methods have different colour because diameter of colloidal gold particles are different. If the particle size is big then it is blue coloured and if the particle size is small then it will be of red colour.
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