The collidal solutions of gold prepared by different methods have different colurs due to :

Options

A. differece in the size and shape :
B. the fact that gold exthbits varible valebncy
C. different concentration of gold
D. presence of different types of collodal particles

Answer

A

Explanation

The colour of any sol depends on its particle size and shape . Au sol is red if particles are speherical and blue of they are disc like .