Which of the following substance gives a positively charged sol?

Gold

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Arsenious sulphide

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Starch

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Ferric hydroxide

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Solution

The correct option is D Ferric hydroxide
Properties of Colloidal Solution:
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. $A l_{2} O_{3} . x H_{2} O, C r O_{3} . x H_{2} O, F e_{2} O_{3} . x H_{2} O$ etc. Metals
Eg. $C u, A g, A u$ sols

2 Basic dye stuffs.Eg. Methylene blue sol Metallic sulphides
Eg. $A s_{2} S_{3}, S b_{2} S_{3}, C d S$ etc

3 Haemoglobin Acid dye stuffs
Eg. Eosin, congo red sols

4 Oxides
Eg. $T i O_{2}$ sol Sols of starch, gum, gelatin, clay, charcoal etc.

Suggest Corrections

S.No	Positively charged sols	Negatively charged sols
1	Hydrated metallic oxides. Eg. $A l_{2} O_{3} . x H_{2} O, C r O_{3} . x H_{2} O, F e_{2} O_{3} . x H_{2} O$ etc.	Metals Eg. $C u, A g, A u$ sols
2	Basic dye stuffs.Eg. Methylene blue sol	Metallic sulphides Eg. $A s_{2} S_{3}, S b_{2} S_{3}, C d S$ etc
3	Haemoglobin	Acid dye stuffs Eg. Eosin, congo red sols
4	Oxides Eg. $T i O_{2}$ sol	Sols of starch, gum, gelatin, clay, charcoal etc.