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Which of the following CANNOT be separated by ordinary filtration?
True solution
Mixture of sand and water
Suspension
Colloidal solution Question ID : 4410091076833 Option 1 ID : 4410094244739 Option 2 ID : 4410094244740 Option 3 ID : 4410094244738 Option 4 ID : 4410094244741 Status : Answered Chosen Option : D
True solution
True solutions and colloidal solutions cannot be separated by ordinary filter paper because their particles are too small to be retained. Among the given options, true solutions have particles smaller than 1┬аnm, which pass through the pores of any standard filter paper.
True solutions and colloidal solutions cannot be separated by ordinary filter paper because their particles are too small to be retained. Among the given options, true solutions have particles smaller than 1┬аnm, which pass through the pores of any standard filter paper.
Trying to filter a true solution with filter paper is like trying to catch water molecules with a fishing net; the particles are simply too tiny to be stopped.
d<1┬аnm тАФ diameter of particles in a true solution
Filtration relies on the difference between the pore size of the filter medium and the particle size of the mixture. In a true solution, the solute particles exist as individual ions or molecules (size <1┬аnm), whereas in a suspension, particles are >1000┬аnm and can be trapped.
True solutions are homogeneous and do not scatter light (Tyndall effect).
Colloids represent an intermediate state with particle sizes between 1┬аnm and 1000┬аnm.
Suspensions are heterogeneous mixtures where particles settle over time.
Ordinary filter paper has pores much larger than 1┬аnm, making it ineffective for true solutions.
Filtration is an efficient physical method for separating heterogeneous mixtures like suspensions.
Filtration cannot separate components of homogeneous mixtures.
Removal of impurities from water.
Separation of precipitates in analytical chemistry.
While the official key mentions True Solution, Colloidal solutions also technically pass through ordinary filter paper, though they can be separated by ultrafiltration.
Option B (Sand and Water) is a suspension and is easily separated by filtration.
A is correct тАФ A true solution consists of particles smaller than 1┬аnm, allowing them to pass through the pores of ordinary filter paper along with the solvent.
Remember the size hierarchy: True Solution (<1┬аnm) < Colloid (1тИТ1000┬аnm) < Suspension (>1000┬аnm). Only Suspensions are easily separated by standard filter paper.
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