31 Year NEET Previous Year Questions: Surface Chemistry

According to Freundlich adsorption isotherm.
At intermediate pressure, extent of adsorption

is linear with slope

The use of membrane for separating colloidal particles is termed as dialysis. Hence it is clear that colloidal particle cannot pass through animal membrane. Hence only solvent molecules and ions (in case of electrodialysis) can diffuse.

According to the Hardyschulze rule the coagulating effect of an ion on dispersed phase of opposite charge increases with the valency of the ion. Therefore more the charge on oppositely charged ion higher is the coagulation value

The critical micelle con centration is the lowest concentration at which micelle formation appears when surfectants are present above that CMC, they can act as emulsifiers that will solubilise a compound which is normally insoluble in the solvent being used.

According to this law the  coagulating effect of an ion on dispersed phase of opposite charge increases with the valency of the ion.
The precipitating power of Al³⁺ , B^a++, Na⁺ ions is in order Al³⁺ > Ba²⁺ > Na⁺.

Electrolyte is used forending charge on colloidal particles.

Pure water can be obtained from seawater by reverse osmosis. The osmotic pressure of   sea water is 25 atm at 15°C. When pressure greater than 26 atm is applied on sea water separated by a rigid semipermeable membrane, pure water is obtained.

Adsorption is the ability of a substance to concentrate or hold gases, liquids or dissolved substances upon its surface. Solids adsorb greater amounts of substances at lower temperature. In general, adsorption decreases with increase in temperature. Read more on Sarthaks.com - https://www.sarthaks.com/229289/which-correct-regarding-the-adsorption-surface-solid-increasing-temperature-adsorption

According to the adsor ption theory of catalysis, the activity of catalysis is due to the presence of free valencies on its surface due to which surface of catalyst has chemical force of altraction. When a gas comes in contact with this surface molecules get attached attached through these valencies.
Further the rate of reaction is always increases by decreases in activation energy When any of the reactants is strongly adsorbed on the surface of catalyst, the rate becomes inversely proportional to the concentration of that reaction. The reaction is then said to be inhibited by such reactant.
The lowering of activation energy always leads to the increase in speed of reaction.

Cetyl trimethyl ammonium bromide,  is a cationic micelle

Micelle formation is sh own by surfactants detergents (Dodecyl trimethyl ammonium chloride) in their aqueous solutions

Langmuir adsorption isotherm is based on the assumption that every adsorption site is  equivalent and the ability of a particle to bind there is independent of whether or not nearby sites are occupied.

The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption isotherm. It is represented as 

Among all the given options, incorrect option is  

According to Freundlich Adsorption isotherm

at low pressure  

at high pressure  

 i.e. the value of n varies between 0 to 1

The lyophobic sols are less stable th an lyophilic sols. The lyophilic sols are thus used to protect the lyophobic sols. This property of lyophilic sols is known as protective action of lyophilic sols.
Which can be represented by gold number.