To solve this problem, we need to understand the properties of colloids and how they relate to the charge of colloidal particles.$\newline$Colloids are mixtures where one substance is dispersed evenly throughout another. The dispersed particles are typically in the range of 1 to 1000 nm.$\newline$Let's analyze each option:$\newline$• Coagulation: This is the process where colloidal particles aggregate to form larger particles, often leading to precipitation.$\newline$ Coagulation is highly dependent on the charge of colloidal particles, as the addition of electrolytes can neutralize the charge, causing particles to aggregate.$\newline$• Electrophoresis: This is the movement of charged colloidal particles under the influence of an electric field.$\newline$ Since this process involves the movement of charged particles, it is directly dependent on the charge of the colloidal particles.$\newline$• Electro-osmosis: This is the movement of the dispersion medium relative to the stationary charged particles under the influence of an electric field.$\newline$ Like electrophoresis, electro-osmosis is dependent on the charge of the colloidal particles.$\newline$• Tyndall effect: This is the scattering of light by colloidal particles, which makes the path of the light visible.$\newline$ The Tyndall effect is not dependent on the charge of the colloidal particles but rather on the size and concentration of the particles.$\newline$Therefore, the property of colloids that is not dependent on the charge of colloidal particles is the Tyndall effect.$\newline$This corresponds to Option 4.