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Q.

The false statement about ultrafiltration is

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a

pore size of normal filter paper can be changed by impregnating it with colloidion solution

b

it is a slow process

c

it involves the use of some special type of filters, called ultrafilters

d

the pore size of ultrafilters is larger than that of the normal filters

answer is B.

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Detailed Solution

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Normal filter paper cannot be used to filter out colloidal particles, as the pore size in normal filter papers are same as the colloid particles. Thus solutes are separated from the colloidal solution using ultra filter paper, where the pore size is small as compared to ordinary filter paper. This method is known as ultra filtration.

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