Question

Take a solution, a suspension, a colloidal dispersion in different beakers. Test whether
each of these mixtures shows the Tyndall effect by focusing a light at the side of the
container.(AS,)​

Answer 1

Answer: Colloidal dispersion will only show Tyndall effect.

We are given 3 beakers having 3 different mixtures: solution, colloid and suspension.

Tyndall effect is the scattering of light by the particles in a mixture.

Particle size in Solutions is very small, therefore no particles will be present to scatter the light, hence no Tyndall effect.

Particle size in Colloids are of intermediate size which means that the particles are suspended in the mixture to scatter the light, hence shows Tyndall effect.

Particle size in Suspension is large, the particles settle down and hence no particles are suspended in the mixture to scatter the light, therefore does not show Tyndall effect.

Hence, only colloidal dispersion shows Tyndall effect.