Surface Chemistry — JEE Advanced PYQs

At a given temperature, 0.45 g of acetic acid in 50 mL of water is shaken with 1.0 g of charcoal and the pH of the resulting solution is 3.0. Assume, the adsorption of acetic acid from the aqueous solution by charcoal follows Freundlich isotherm,

If the …

Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from $10\mathrm{mg}{\mathrm{g}}^{-1}$ and $16\mathrm{mg}{\mathrm{g}}^{-1}$ aqueous phenol solutions, the concentrations of adsorbed phenol are measured to be …

To form a complete monolayer of acetic acid on 1g of charcoal, 100 mL of 0.5 M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1 M NaOH solution was required. If each molecule of acetic acid occupies …

Consider the following statements related to colloids.
(I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium.
(II) For emulsions, both the dispersed phase and the dispersion medium are liquid.
(III) Micelles are produced by dissolving a s …

The correct option(s) related to adsorption processes is(are)

The correct statement(s) related to colloids is(are)

Molar conductivity (${\Lambda }_{\mathrm{m}}$) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentration(c) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in th …

The correct statement(s) about surface properties is(are)

When O₂ is adsorbed on a metallic surface, electron transfer occurs from the metal to O₂. The TRUE statement(s) regarding this adsorption is(are)

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25 °C. For this process, the correct statement is

The given graphs / data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

Choose the correct reason(s) for the stability of the lyophobic colloidal particles.

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)

Among the electrolytes ${\mathrm{Na}}_2{\mathrm{SO}}_4,{\mathrm{CaCl}}_2,{\mathrm{Al}}_2({\mathrm{SO}}_4{)}_3$ and ${\mathrm{NH}}_4\mathrm{Cl}$, the most effective coagulating agent for ${\mathrm{Sb}}_2{\mathrm{S}}_3$ sol is

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