A process 'X' is used in purification of colloid solutions. Identify 'X' with the following points:

a. the filter paper is made of cellophane

b. it is a slow process

c. the particles of the solution are removed from the liquid medium by electrolysis at first

The size of the pores is reduced in filter paper made from colloids or some regenerated cellulose, such as cellophane. Ultrafilter is the name for this altered variety of filter paper. Ultrafiltration is the procedure by which the solution's particles are eliminated from the liquid medium using electrolysis and the name comes about by use of this ultrafilter. It proceeds slowly. Some external gas pressure must be supplied to the operation to accelerate it up.