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Q.

A colloidal sol of Fe(OH)3 in water is

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a

A hydrophobic colloid

b

An emulsion

c

A hydrophilic colloid

d

None of these

answer is B.

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Detailed Solution

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Fe(OH)3 sol can be prepared by hydrolysis of FeCl3.

Affinity between Fe(OH)3  & water is less so special techniques are required to prepare it.

  \therefore It is hydrophobic

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