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Chemistry Question on Colloids

The charge on Fe(OH)3Fe(OH)_3 sol is due to

A

adsorption of hydroxyl ion

B

adsorption of hydrogen ion

C

adsorption of ferric ion

D

absorption of ferric ion

Answer

adsorption of ferric ion

Explanation

Solution

Fe(OH)3Fe ( OH )_{3} sol carries charge because of the adsorption of ferric ions as
Fe(OH)3+FeCl3→Fe(OH)3 sol of ferric hydroxide :Fe3++3Cl−Fe ( OH )_{3}+ FeCl _{3} \rightarrow \underset{\text { sol of ferric hydroxide }}{ Fe ( OH )_{3}}: Fe ^{3+}+3 Cl ^{-}