Question

The incorrect statement below regarding colloidal solutions is:

• A. A colloidal solution shows colligative properties
• B. An ordinary filter paper can stop the flow of colloidal particles
• C. A colloidal solution shows the Brownian motion of colloidal particles
• D. The flocculating power of ${\mathrm{Al}}^{3+}$is more than that of ${\mathrm{Na}}^{+}$

Answer 1

The correct option is B

An ordinary filter paper can stop the flow of colloidal particles

The correct option is (b)

The Explanation for the correct options:

(b)

• Explanation: Because the filter paper's pore size is smaller than the colloidal particles, ordinary filter paper that has been impregnated with collodion solution will not allow colloidal particles to pass through.
• Regular filter paper's pores allow for the passage of colloidal particles because they are too large.
• Filter paper's pores can be constrained in size by being impregnated with collodion solution, which will stop the flow of colloidal particles.

The Explanation for the incorrect options:

(a)

• Explanation: Colloidal particles show coliigative properties but they have a low value of colligative properties.

(c)

• Explanation: Brownian movement results from the interaction of the colloidal particles with the molecules of the dispersion medium.
• The zigzag motion of colloidal particles is referred to as Brownian movement.
• It is brought about by collisions between colloidal particles and the molecules of the dispersion medium.

(d)

• Explanation: The more valency the flocculating material has Ion addition increases its ability to produce precipitation.
• It implies that an ion with a higher valency has a stronger flocculating power. The ability of an ion to precipitate colloids is directly correlated with its valency.

The correct option is (b): To stop the flow of colloidal particles, filter paper can have its pores enlarged by being impregnated with collodion solution.