Question

The right option for the statement “Tyndall effect is exhibited by”, is

• A. Urea solution
• B. NaCl solution
• C. Glucose solution
• D. Starch solution

Answer 1

The Correct Option is C

I'm here to help you with the given question. Let's explore the concept behind the Tyndall effect and identify the correct solution step-by-step.

The Tyndall effect refers to the scattering of light as it passes through a colloidal solution or heterogeneous mixture where the particle size is in the range of 1 to 1000 nanometers. This phenomenon causes the light beam to become visible when it passes through such a medium. 

1. To understand which substance exhibits the Tyndall effect, it’s crucial to grasp the distinction between solutions, colloids, and suspensions:
   • Solution: A homogeneous mixture where the particle size is usually less than 1 nanometer. Examples include urea solution, NaCl solution, and glucose solution. These do not scatter light and therefore do not exhibit the Tyndall effect.
   • Colloid: A mixture where the particle size ranges from 1 to 1000 nanometers. Colloids can scatter light, exhibiting the Tyndall effect. Examples include milk, fog, and starch solution.
   • Suspension: A heterogeneous mixture with particles that are larger than 1000 nanometers. These can also scatter light but are not as stable as colloids.
2. Among the given options:
   • Urea solution is a true solution, where urea dissolves completely in water.
   • NaCl solution is also a true solution due to complete dissociation of NaCl in water.
   • Glucose solution dissolves completely in water, forming a true solution.
   • Starch solution forms a colloid because starch particles do not completely dissolve in water.
3. Based on these observations, the starch solution is a colloid and therefore the correct answer that exhibits the Tyndall effect.

Conclusion: The correct answer is the starch solution, not the glucose solution as it is listed. The starch solution is the option among those provided that actually exhibits the Tyndall effect.