In which of the following colloidal solutions is the dispersed phase liquid while the dispersion medium is gas?

Which of the following is the most effective electrolyte for the coagulation of gold sol?

On which of the following properties does coagulating power of an ion depend?

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:

The colour of a colloidal solution is due to

Which of the following nanomaterials has all three dimensions $< 100 \text{ nm}$?