Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water ?
Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water ?
A. Due to precipitation of ferric hydroxide there is an excess of `Fe^(3+)` ions.
B. Due to preferential adsorption of `Fe^(3+)` ions by the sol of `Fe(OH)_(3)`.
C. Due to absence of any negatively charged ion.
D. Due to adsorption of `OH^(-)` and `Cl^(-)` ions, the remaining sol has only `Fe^(4+)` ions.
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Correct Answer - B
The adsorption of positively charged `Fe^(3+)` ions by the sol of hybrated ferric oxide results in positively charged colloid.
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