A kind of filtration method, where the suspended solids/ solutes are separated from the colloidal solution because of their concentration gradient, by passing the solution through a semipermeable membrane is known as :

Ultra filtration

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Ultra centrifugation

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Dialysis

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Electrodialysis

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Solution

The correct option is A Ultra filtration
This kind of filtration process where the solid/ solutes are separated from the colloidal solution because of concentration gradient, using a semipermeable membrane is known as ultra filtration. The high molecular weight solutes are retained and hence known as retentate. While the low molecular weight solute or water pass through the semipermeable membrane and hence known as permeate. Ultra filtration method is specially used in industries to purify colloidal solutions, where the macromolecules have a weight of around $10^{5}$ dalton.

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