Question

In true solution, size of solute particles is
A) Less than 0.001 micrometer
B) 0.01 micrometer - 0.1 micrometer
C) More than 0.1 micrometer
D) None of the above

Answer 1

Hint: A solution is defined as a homogenous mixture that comprises two or more substances, a solute is the substance that is being dissolved and a solvent is the liquid part where the solutions mix and dissolve.

Complete answer:
A solution has several characteristic properties such as it does not allow a beam of light to scatter, the particles of a solution cannot be seen with naked eye, the solute particles cannot be separated from the solution by means of filtration and it comprises only one phase.

Based on particle size solutions can be categorized into three types- true solutions, colloidal solutions and suspensions. True solutions are defined as homogenous mixtures of substances where the particle size is less than 0.001 micrometer or 1 nanometer and they are not visible by the naked eye.

Colloidal solutions are those where heterogenous mixture of particles take place. The particle size ranges from 1 to 1000 nanometer and like true solutions the particles are not visible by naked eyes.

Suspensions are also heterogeneous mixtures where the size of the particle is greater than 1000 nanometer and the particles are large enough to be visualized by naked eye.

So the correct option is (A) i.e, Less than 0.001 micrometer.

Note: Apart from visibility and particle size another point of difference exists between these three solutions on the basis of filterability, particles of true solutions and colloidal solutions cannot be filtered by passing through filter paper but particles of suspensions can be filtered by passing through filter paper.