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a
it involves the use of some special type of filters, called ultrafilters
b
the pore size of ultrafilters is larger than that of the normal filters
c
it is a slow process
d
pore size of normal filter paper can be changed by impregnating it with colloidion solution
answer is B.
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Detailed Solution
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.