Question:

The right option for the statement ''Tyndall effect is exhibited by'', is :

Updated On: Nov 13, 2025

NaCl solution
Glucose solution
Starch solution
Urea solution

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The Correct Option is C

Approach Solution - 1

The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions. Solutions that exhibit the Tyndall effect appear colorful when viewed from a direction perpendicular to the light beam due to the scattering of light. Let's analyze the options to identify which solution shows this effect:

NaCl solution: Sodium chloride forms a true solution when dissolved in water, which means the particles are completely dissociated into ions. True solutions do not scatter light because their particles are too small to scatter visible light, so they do not exhibit the Tyndall effect.
Glucose solution: Glucose, like NaCl, forms a true solution in water. The particles or molecules of glucose are also too small to scatter light, hence, it does not show the Tyndall effect.
Starch solution: Starch forms a colloidal solution in water. Colloids have larger particle sizes compared to true solutions, which can scatter light and thus exhibit the Tyndall effect. This scattering is what makes the beam of light visible in the colloidal dispersion of starch in water.
Urea solution: Similar to NaCl and glucose, urea dissolves in water to form a true solution. Particles are too small to scatter light, so it does not show the Tyndall effect.

Based on the above analysis, the correct answer is the starch solution because starch forms colloidal particles that are capable of scattering light, displaying the Tyndall effect.

Conclusion: The right option for the statement "Tyndall effect is exhibited by" is the starch solution, as it is the only one that forms a colloid. The particle sizes in colloids are large enough to affect the passage of light through them, leading to light scattering.

Tip: Remember, the Tyndall effect is a characteristic of colloids and not of true solutions.

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Approach Solution -2

Tyndall effect is visible in colloidal sol. A colloid is starch.

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List II	List II
A. Osmosis	I. Solvent molecules pass through semi permeable membrane towards solvent side.
B. Reverse osmosis	II. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
C. Electro osmosis	III. Solvent molecules pass through semi permeable membrane towards solution side.
D. Electrophoresis	IV. Dispersion medium moves in an electric field.

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Concepts Used:

Classification of Colloids

Based on the Nature of Interaction Between Dispersed Phase and Dispersion Medium:

Hydrophilic colloids: These are water-loving colloids. The colloid particles are attracted to the water. They are also known as reversible sols. Examples include Agar, gelatin, pectin, etc
Hydrophobic colloids: These are the opposite in nature to hydrophilic colloids. The colloid particles are repelled by water. They are also called irreversible sols. Examples include Gold sols, clay particles, etc

Based on Type of Particles of Dispersed Phase:

Multimolecular Colloids: A large number of smaller molecules of a substance add on together on mixing and form species that are in the colloidal range.
Macromolecular Colloids: In this colloid, the macromolecule forms a solution with a solvent. The size of particles remains in the range of colloidal particle size. Here, the colloidal particles are macromolecules having a very large molecular mass.
Associated Colloids: Few substances react as strong electrolytes when they are in low concentration, but act as colloidal sols when they are in high concentration. In high concentration, particles aggregate and show colloidal behaviour and these particles are known as the micelles. They are also known as associated colloids. The formation of micelles occurs above a certain temperature and specific concentration. These colloids can be reverted by diluting it.