Question
Classify colloids where the dispersion medium is water. State their characteristics and write an example of each of these classes.

Answer

They are of two types
  1. Hydrophilic.
  2. hydrophobic.
The hydrophile sol is more stable and reversible while hydrophobic sol is less stable and is irreversible.
Hydrophilic sol e.g. $\rightarrow$ Starch, gum, gelatin etc.
Hydrobhobic sol e.g $\rightarrow$ metal sulphide, metal hydroxide.

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