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Q.

Which of the following substances gives a positively charged sol?

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a

Gold

b

A metal sulphite

c

Ferric hydroxide

d

An acidic dye

answer is C.

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Detailed Solution

$Fe {(OH)}_{3}$ gives a positively charged sol as it adsorbs ${Fe}^{3 +}$ ions from ${FeCl}_{3}$ solution.

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