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Q.

Which of the following is a positively charged sol ?

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a

CrO3xH2O

b

All of these

c

Al2O3xH2O

d

Fe2O3xH2O

answer is D.

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Detailed Solution

Colloidal particles always carry an electric charge. In a given colloidal solution, nature of the charge is same on all the particles (either positive or negative)

Positively charged sols:

Hydrated metallic oxides. Eg. Al2O3.xH2O,CrO3.xH2O,Fe2O3.xH2O etc.

Basic dye stuffs. Eg. Methylene blue sol

Haemoglobin, Oxides Eg. TiO2 sol.

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