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Q.

which of the following methods to prepare solution, the colloidal particles will be positively charged?

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a

Gold sol by Bredig-Arc method.

b

Addition of little KOH in freshly prepared precipitate of AI(OH)3".

c

100 mL of 10-6 MAgNO3 +1OOmL of 10-4M KI

d

Addition of little FeCl3. in freshly prepared precipitate of Fe(OH)3.

answer is D.

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