Embibe Experts Solutions for Chapter: Surface Chemistry, Exercise 3: Level 3

Modified quantum dot nanoparticles_____   

The pressure of the gas was found to decrease from $720$ to $480 \mathrm{mm}$ of Hg. When $5 \mathrm{g}$ of the sample of activated charcoal was kept in a flask of one litre capacity maintained at $27°\mathrm{C}$. If the density of charcoal was at $1.25\mathrm{g}/$$\mathrm{mL}$. The volume of gas adsorbed per $\mathrm{gm}$ of charcoal at $480 \mathrm{mm}$ of $\mathrm{Hg}$ is:

Graph between $\log \mathrm{x}/\mathrm{m}$ and $\log \mathrm{p}$ is a straight line inclined at an angle of $45°.$ When pressure is $0.5 \mathrm{atm}$ and $\ln \mathrm{k}=0.693,$ the amount of solute adsorbed per $\mathrm{gm}$ of the adsorbent will be:

Which is an example of coagulation?

The adsorption isotherm for a gas is given by the relation $\mathrm{x}=\mathrm{a} \mathrm{p}/\left(1+\mathrm{bp}\right)$, where $\mathrm{x}$ is moles of gas adsorbed per gram of the adsorbent, $\mathrm{p}$ is the pressure of the gas, and $\mathrm{a}$ and $\mathrm{b}$ are constants. Then, $\mathrm{x}$:

Statement $1$: Micelles are formed by surfactant molecules above the critical micelle concentration ($\mathrm{CMC}$) because

Statement $2$: The conductivity of a solution having surfactant molecules decreases sharply at the $\mathrm{CMC}$.

Among the following, the surfactant that will form micelles in the aqueous solution at the lowest molar concentration at ambient conditions is

(Hint: During the micelle formation, the number of ions decrease as a result of which conductance reduces. The formation of micelles, thus, also reduces the osmotic pressure, thereby increasing the average molar mass of the hydrocarbon chain of the surfactant.)

$\mathrm{x} \mathrm{g}$ of gas is absorbed per $\mathrm{m} \mathrm{gram}$ of a solid. A plot $\frac{\mathrm{x}}{\mathrm{m}}$ vs pressure $\mathrm{p}$ at two different temperatures, ${\mathrm{T}}_1$ and ${\mathrm{T}}_2$, shows

The plot of $\log \frac{\mathrm{x}}{\mathrm{m}}$ vs $\log \mathrm{p}$ should be a straight line