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Question

FeCl3 is added separately to excess of boiling water and excess of NaOH solution; the solution obtained contain the dispersed particle to:

A
Fe(OH)3/H+;Fe(OH)3/OH
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B
Fe(OH)3/Fe3+;Fe(OH)3/OH
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C
FeCl3/Fe3+;FeCl3/OH
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D
Fe(OH)3/Fe3+;Fe(OH)3/Na+
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Solution

The correct option is B Fe(OH)3/Fe3+;Fe(OH)3/OH
Addition of FeCl3 to hot water produce a positive charged solution due to absorption of Fe3+ .
A negative charged solution is when FeCl3 is added to NaOH solution.
FeCl3+2NaOHFe(OH)3+3NaCl
The absorption of OH ions forms an electric double layer.
Option B Fe(OH)3/Fe3+,Fe(OH)3/OH is the answer.

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