Question

22.Identify the correct statement from the following. A. A solution does not scatter light. B. A colloid is a homogeneous mixture. C. The particles of a suspension cannot scatter light. D. The particles of a colloid are larger than the particles of a suspension​

Answer 1

The correct statement from the following is A. A solution does not scatter light.

• True solutions are homogeneous systems and have a diameter of dispersed particles less than 1 nanometre (nm). Due to the very small size of the dispersed particles, true solutions cannot scatter light.
• Colloidal solutions are heterogeneous systems and have the diameter of dispersed particles lying between 1 nm and 1000 nm. Since the dimensions of the colloidal particles are comparable to the wavelength of the ultraviolet and visible radiations, they scatter these radiations and get illuminated.
• The particles of a suspension may or may not scatter light. The size of particles present in a suspension is more than 1000 nm.
• The particles of a suspension are larger than the particles of a colloid.

Answer 2

The correct statement is A. A solution does not scatter light.

What is a solution?

• Solution is a homogeneous mixture of solute particles dissolved completely in a solvent.
• The size of particles in solution is less than 1 nanometres in diameter.
• Particles in a solution cannot even be detected with naked eyes.
• Since the particles size is too small, light cannot be scattered in solutions.

What is colloid?

• Colloids are heterogeneous solutions with particles dispersed uniformly in the solvent medium.
• Size of particles in colloids is more than 1 nanometre and less than 1 micrometre.
• Due to bigger size of particles, colloids show Tyndall effect which is scattering of light by particles.

What is suspension?

• A suspension is a heterogeneous mixture of solvent and solute where solute particles do not dissolve in solvent medium.
• When kept undisturbed for some time, solute gets suspended at the bottom of the container.
• Size of particles here is above 1 micrometre.
• We can see particles with naked eyes in a suspension.
• Due to greater size of particles, there is scattering of light and in some cases, suspension acts as an opaque medium to light.
• Particles of suspension are greater than particles of colloids.