Which of the following constitute irreversible colloidal system in water as dispersion medium?

C d S

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Gold sols

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Copper

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All of these

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Solution

The correct option is D All of these
Irreversilbe sols are those which once precipitated, do not give back the colloidal sol by simple addition of the dispersion medium.
Substances like metals, their sulphides, etc., form irreversilbe sols.
Therefore all of these options are irreversible colloidal systems.

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