Which one of the following processes does not involve coagulation?

Peptization

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Formation of delta

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Purification of drinking water using alum

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Tanning of leather using tannin

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Solution

The correct option is B Peptization
Peptization does not involve coagulation.
Peptization is the process of converting a precipitate into colloidal particles by adding suitable electrolyte.
Coagulation represents change of colloidal state to suspension state.
Thus, coagulation and peptization represents opposite processes.

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