Molar conductivity $\left(\Lambda_m\right)$ of an aqueous solution of sodium stearate,which behaves as a strong electrolyte,is recorded at varying concentrations $(c)$ of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (Critical micelle concentration $(CMC)$ is marked with an arrow in the figures.)

$As_2S_3$ sol has a negative charge. The maximum coagulation power will be of:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Finest gold is red in colour,as the size of the particles increases,it appears purple then blue and finally gold.
Assertion $R$: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.
In the light of the above statements,choose the most appropriate answer from the options given below:

$Fe(OH)_3$ sol and gold sol are positively and negatively charged,respectively. Which of the following statements is incorrect?

Arrange the following electrolytes in the increasing order of coagulation power for the coagulation of $As_2S_3$ sol.
$\mathop {K_2SO_4}\limits_{(I)}$ $\mathop {CaCl_2}\limits_{(II)}$ $\mathop {Na_3PO_4}\limits_{(III)}$ $\mathop {AlCl_3}\limits_{(IV)}$

Which one of the following statements is $FALSE$ for hydrophilic sols?