Which of the following substances is classified as a macromolecular colloid?

Under ambient conditions,which among the following surfactants will form micelles in aqueous solution at the lowest molar concentration?

The sol given below with negatively charged colloidal particles is:

What is the primary test to verify whether a solution is in colloidal form or not?

When the dispersion medium is water,the colloidal system is called:

Tyndall effect is observed only when:
$(i)$ the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
$(ii)$ the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
$(iii)$ the size of the particles is generally between $10^{-11} \ m$ and $10^{-9} \ m$ in diameter.
$(iv)$ the dispersed phase and the dispersion medium can be seen separately in the system.