NEET Chemistry Surface Chemistry Questions Solved

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What is the difference between lyophobic sol and lyophilic sol?

Lyophobic sols: Substances like metals, their sulphides, etc.,

when simply mixed with the dispersion medium do not form 

the colloidal sol. Their colloidal sols can only be prepared 

by specific methods. They are not much hydrated and are 

irreversible in nature. They are called extrinsic colloids.

Example: AS2S3 sol.

Lyophilic sols: Liquid loving colloids in which there is affinity

between disperse phase and dispersion medium.

Example: Starch sol, Gum sol, Gelatine sol.

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