हिंदी

Lyophilic and Lyophobic Sols

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Lyophilic and Lyophobic Sols

Feature Lyophilic Sols Lyophobic Sols
Meaning "solvent-loving" "solvent-hating"
Affinity High affinity for dispersion medium No affinity for dispersion medium
Formation Direct mixing (intrinsic colloids) By indirect methods (extrinsic colloids)
Stability Stable; not easily coagulated Less stable; easily coagulated by electrolytes/heating
Examples Starch, gum, albumin As₂S₃, Fe(OH)₃, gold
Reversibility Can be brought back to colloidal state by agitating with dispersion medium (reversible) Cannot be brought back easily (irreversible)
Water as a medium Hydrophilic sols Hydrophobic sols
Stabiliser needed No Yes (stabilising substance needed)
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