Select the correct statement(s): (a) A sol is prepared by addition of excess of \( \mathrm{AgNO}...

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Select the correct statement(s):
(a) A sol is prepared by addition of excess of \( \mathrm{AgNO}_{3} \) solution in KI solution. The charge likely to develop on colloidal particle is positive
(b) The effects of pressure on physical adsorption is high if temperature is low
(c) Ultracentrifugation process is used for preparation of colloids
(d) Gold number is the index for extent of gold plating done
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