Question

Which of the following solution does not show the Tyndall effect?

• A. Milk
• B. Starch solution
• C. Ink
• D. Sugar solution

Answer 1

The correct option is D

Sugar solution

The explanation for the correct option:

(d) Sugar solution:

1. The Tyndall effect, also known as the Tyndall phenomenon, is the scattering of a light beam by a medium containing tiny suspended particles.
2. The sugar solution is a homogeneous, true solution.
3. Sugar solution doesn't exhibit the Tyndall effect because the particles in these solutions are too tiny to scatter light in several directions.

The explanation for incorrect options:

(a) Milk:

1. A solution in which the size of solute particles is intermediate between those in true solution and suspension is called a colloidal solution.
2. Milk is a colloidal solution. It is a mixture of liquid fat globules which are dispersed and suspended in water.
3. When a light beam is passed through milk, it exhibits the Tyndall effect.

(b) Starch solution:

1. Starch is slightly soluble in water.
2. As starch solutions are colloids, they will exhibit the Tyndall effect.

(c) Ink:

1. Ink is a colloidal solution as its particles neither completely dissolve nor never settle to the bottom.
2. The Tyndall effect is seen in ink.

Hence option (d) is the correct option.