During an experiment the students prepared three mixtures A)Starch in water B) Sodium chloride solution C) Tincture of Iodine. i) Students observed a visible beam of light through mixture A. Why? ii) Tincture of Iodine did not show Tyndall effect . Explain reason. iii) How can you relate particle size to Tyndall effect?

The question requires a good knowledge of the meaning of Tyndall effect or scattering of light by false solutions in chemistry

The student observed a beam of visible light through mixture A because A exhibits Tyndall effect

Tincture of Iodine does not show Tyndall effect because its solution consists of particles less than 1 nanometer in solution.

A solution may be classified as a true solution or a false solution. A true solution consists of particles which are less than 1 nanometer in solution. A true solution does not scatter visible light.

A false solution, on the other hand consists of particles larger than 1 nanometer and does scatter visible light.

Starch in water is an example of a false solution or colloid hence it exhibits Tyndall effect. The scattering of visible light by a solution is known as Tyndall effect.

Tincture of iodine and sodium chloride in water are all true solutions hence they do not scatter visible light.