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When a few drops of dil. HCl is added to...

When a few drops of dil. HCl is added to a freshly prepared `Fe(OH)_(3)` solution, a red colloidal solution is produced. What do you call this phenomenon?

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CHHAYA PUBLICATION-SURFACE CHEMISTRY-Exercise
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  4. Which is a hydrophobic sol-gum, gelatin, sulphur?

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