For the coagulation of a positively charged hydrated ferric oxide sol,the flocculating power of the ions is in the order:

The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
$A$. The diameter of the colloidal particles is comparable to the wavelength of light used.
$B$. The diameter of the colloidal particles is much smaller than the wavelength of light used.
$C$. The diameter of the colloidal particles is much larger than the wavelength of light used.
$D$. The refractive indices of the dispersed phase and the dispersion medium are comparable.
$E$. The dispersed phase has a very different refractive index from the dispersion medium.
Choose the most appropriate conditions from the options given below:

What is the coagulating power of an effective ion carrying a charge opposite to that of the sol particles called?

$Fe(OH)_3$ sol is

Which of the following is most effective in coagulating a ferric hydroxide sol?

Choose the incorrect statement from the following: