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Standard XII
Chemistry
Tyndall Effect
The charges o...
Question

The charges on the colloidal CdS sol and TiO2 sol are, respectively

A
positive and negative
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B
negative and negative
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C
negative and positive
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D
positive and positive
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Solution

The correct option is C negative and positive
Answer: (c)
Charge on Colloidal Particles: 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)
S.No Positively charged sols Negatively charged sols
1 Hydrated metallic oxides. Eg. Al2O3.xH2O,CrO3.xH2O,Fe2O3.xH2O etc. Metals
Eg. Cu,Ag,Au sols
2 Basic dye stuffs.Eg. Methylene blue sol Metallic sulphides
Eg. As2S3,Sb2S3,CdS etc
3 Haemoglobin Acid dye stuffs
Eg. Eosin, congo red sols
4 Oxides
Eg. TiO2 sol		 Sols of starch, gum, gelatin, clay, charcoal etc.

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