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# A colloidal solution of gold in water is

(a) red in colour
(b) blue in colour
(c) golden spangles
(d) all the three

Toolbox:
• Colour of a colloidal solution depends upon the particle size.
Colour of a colloidal solution depends upon the particle size. As the particle size increases, the colour of gold sol changes from red to blue and finally to golden spangles. At this stage, it turns into a suspension.