Step 1: Understanding the Tyndall effect.
The Tyndall effect is the scattering of light by colloidal particles, which causes the beam of light to become visible as it passes through the colloidal solution. This phenomenon is commonly observed in colloidal solutions like milk or fog.
Step 2: Analyzing the options.
(A) Neutralization of charge on colloidal particles: This is incorrect. The Tyndall effect is not related to charge neutralization, but to light scattering.
(B) Zig-zag motion of colloidal particles: This is incorrect. The zig-zag motion of colloidal particles is known as Brownian motion, not the Tyndall effect.
(C) Precipitation of colloidal particles: This is incorrect. Precipitation involves the settling of colloidal particles, not light scattering.
(D) Scattering of light by colloidal particles: This is correct. The Tyndall effect is the result of the scattering of light by colloidal particles.
Step 3: Conclusion.
The correct answer is (D) Scattering of light by colloidal particles.