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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
Can you answer this question?

Toolbox:
• Colour of a colloidal solution depends upon the particle size.
Answer: all the three
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.
answered Mar 17, 2014