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Chemistry
Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water?
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Q. Why is ferric hydroxide colloid positively charged when prepared by adding ferric chloride to hot water?
Surface Chemistry
A
Due to precipitation of ferric hydroxide there is an excess of $Fe^{3+}$ ions.
24%
B
Due to preferential adsorption of $Fe^{3+}$ ions by the sol of $Fe(OH)_3$.
47%
C
Due to absence of any negatively charged ion.
13%
D
Due to adsorption of $OH^-$ and $Cl^-$ ions, the remaining sol has only $Fe^{3+}$ ions.
16%
Solution:
The adsorption of positively charged $Fe^{3+}$ ions by the sol of hydrated ferric oxide results in positively charged colloid.