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Give reason: Special type of filter pape...

Give reason: Special type of filter paper are used for filteration of colloidal solutions.

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The diameter of colloidal particles range between 1-1000 nm. Pore size of ordinary filter paper is more than 1000 nm. As such colloidal particles can easily pass through an ordinary filter paper. Therefore, special type of filter paper called ultra filter paper with pore size less than 1 nm is used to separate colloidal particles from dispersion medium.
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Read the following passage and answer the questions. Ultrafiltration is the process of separating the colloidal particles from the solvent and soluble solutes present in the colloidal solution by specially prepared filters, which are permeable to all substances except the colloidal particles. Colloidal particles can pass through ordinary filter paper because the pores are too large. However, the pores of filter paper can be reduced in size by impregnating with collodion solution to stop the flow of colloidal particles. The usual collodion is a 4% solution of nitrocellulose in a mixture of alcohol and ether. An ultra-filter paper may be prepared by soaking the filter paper in a collodion solution, hardening by formaldehyde and then finally drying it. Thus, by using ultra-filter paper, the colloidal particles are separated from rest of the materials. Ultrafiltration is a slow process. To speed up the process, pressure or suction is applied. The colloidal particles left on the ultra-filter paper are then stirred with fresh dispersion medium (solvent) to get a pure colloidal solution. What is ultrafiltration ?

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