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Q.

Which one of the following forms a negatively charged sol ?

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a

Cr₂O₃.xH₂O

b

Al₂O₃. xH₂O

c

TiO₂

d

CdS

answer is D.

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Detailed Solution

Positive sols: Hydrated metal oxides, Basic dye stuffs(methylene blue), Haemoglobin, metal oxides

Negative sols: Metai sols, Sulphide sols, Acid dye stuffs(eosin, ongored), starch, gum gelatin, clay, charcoal

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Which one of the following forms a negatively charged sol ?