The average molecular mass of colloids can be determined by:

tyndall effect

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brownian movement

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osmotic pressure

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flocculation

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Solution

The correct option is B osmotic pressure
The average molecular mass of colloids can be determined by osmotic pressure.

Note: Colloidal particles are not simple molecules but a physical aggregation of molecules. For a given mass of sol, the number of particles will be very small and osmotic pressure will be very low.

Option $C$ is correct.

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