In soap lather,the dispersed phase and dispersion medium are respectively ....

Three graphs for $R(CH_2)_nCOONa$ are shown. The correct values of '$n$' for graphs $I, II,$ and $III$ may be matched as:

Which of the following solutions is used in the styptic action which prevents bleeding of blood?

Which one of the following is used in the hardening of leather?

Under the influence of an electric field,the particles in a sol migrate towards the cathode. The coagulation of the same sol is studied using $NaCl$,$Na_2SO_4$,and $Na_3PO_4$ solutions. Their coagulating values will be in the order:

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.