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(a) What are lyophilic and lyophobic sol...

(a) What are lyophilic and lyophobic sols ? Give one example for each.
(b) What is Tyndall effect ?

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(a) Lyophilic sol : has affinity towards dispersion medium
Example : Starch sol, albumin sol, gelatin, glue.
Lyophobic sol : Has no (or little) affinity towards dispersion medium.
Example : Sulphur sol, Metal sol, Metal oxide sol, slophide sols.
(b) Scattering of light by colloidal particles.
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