Colloidal solution of gold prepared by different methods have different colours, because
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a
Variable valencies of gold
b
Difference in the concentration of gold particles
c
Impurities produced by different methods
d
Difference in the diameter of colloidal gold particles
answer is D.
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Detailed Solution
Size and shape of colloidal particles are responsible for the colour of colloidal sols. Ex: As the size of the gold particles increases the sol appers Red,purple,blue and finally gold