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Electrical Properties of Colloids

Which of the ...

Question

Which of the following substances gives a positively charged sol?

A

Gold

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B

Arsenious sulphide

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C

Starch

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D

Ferric hydroxide

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Solution

The correct option is D Ferric hydroxide
Ferric hydroxide is a positively charged sol whereas Gold, Starch and arsenious sulphide are negatively charged sols.

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