Solution

The word ‘lyophilic’ means liquid-loving. The word ‘lyophobic’ means liquid-hating. In Lyophilic sols if the dispersion medium is separated from the dispersed phase, the sol can be reconstituted by simply remixing with the dispersion medium. That is why these sols are also called reversible sols. In Lyophobic sols when dispersed phase simply mixed with the dispersion medium do not form the colloidal sol. hence, they are called irreversible sols. Lyophilic sols are quite stable and cannot be easily coagulated. Lyophobic sols are readily coagulated on the addition of small amounts of electrolytes, by heating or by shaking and hence, are not stable.