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# A colloidal solution of gold in water is

$(a)\;redin\;colour\qquad(b)\;blue\;in\;colour\qquad(c)\;golden\;spangles\qquad(d)\;all\;the\;three$

Explanation :
Colour of a colloidal solution depends upon 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 .
edited Mar 18, 2014 by yamini.v