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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry3 Marks
Question
Differentiate lyophillic and lyophobic colloids
✓

Answer

Lyophiltic colloids
  1. In lyophillic colloids (or) sols definite attractive force (or) affinity exists between dispersion medium and dispersed phase.
  2. e.g., Sols of protein, starch
  3. They are more stable and will not get precipitated readily.
  4. They can be brought back to colloidal solution even after the precipitation by addition of dispersion medium
  5. They arc called reversible sols
Lyophobic colloids
  1. In lyophobic colloid no attractive force exists between dispersed phase and dispersed phase and dispersion medium.
  2. e.g., sols of gold, silver
  3. They are less stable and get precipitated readily
  4. They cannot be produced again by adding the dispersion medium.
  5. They are called irreversible sols.

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