What are lyophobic colloids? Give one example for them.

Lyophobic colloids are colloidal solutions in which dispersed phase has very little affinity for the dispersion medium.

Such solutions are unstable and are irreversible in nature. Eg. Sols of metals and their insoluble compounds like sulphides and oxides.

Lyophobic colloids can be easily coagulated because on addition of small amount of electrolyte, the charge on colloidal particles is removed, due to which the particles will come closer to each other and under the influence of gravity, theycombine to form a cluster and settle down.