Option (iii) is correct. Air with dust particles and starch with water show the Tyndall effect because their dispersed particles scatter light, making the path of the light beam clearly visible to the observer nearby.
Choose the correct options and explain the reason for the correct and incorrect options. Which among the following mixtures show the Tyndall Effect? A mixture of: (a) air and dust particles (b) copper sulfate and water (c) starch and water (d) acetone and water (i) a and b (ii) b and d (iii) a and c (iv) c and d
Share
Option iii is correct because air containing dust particles and starch mixed with water can scatter light and show the Tyndall effect. The chapter explains that particles in a colloid or suspension scatter light, making its path visible. Copper sulfate solution and acetone with water are solutions, so their particles do not scatter light sufficiently to make the light beam visible clearly to the observer.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/