Surface Chemistry — JEE Main PYQs

${\mathrm{CH}}_4$ is adsorbed on 1 g charcoal at $0^{\circ }\mathrm{C}$ following the Freundlich adsorption isotherm. 10.0 mL of ${\mathrm{CH}}_4$ is adsorbed at 100 mm of Hg , whereas 15.0 mL is adsorbed at 200 mm of Hg . The volume of ${\mathrm{CH}}_4$ adsorbed at 300 mm of Hg …

Select the graph that correctly describes the adsorption isotherms at two temperatures $T_1$ and $T_2\left({\mathrm{T}}_1>{\mathrm{T}}_2\right)$ for a gas :
( x - mass of the gas adsorbed ; m - mass of adsorbent ; P - pressure)

$\mathrm{CO}{}_2$ gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of $\mathrm{CO}{}_2$ adsorbed becomes 64 times when the pressure of $\mathrm{CO}{}_2$ is doubled. The value of $n$ in the Freundlich isotherm equation is ______ …

A colloidal system consisting of a gas dispersed in a solid is called a/an:

Sodium stearate ${\mathrm{CH}}_3{\left({\mathrm{CH}}_2\right)}_{16}{\mathrm{COO}}^{-}{\mathrm{Na}}^{+}$is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following:

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: ${\mathrm{SO}}_2(\mathrm{g})$ is adsorbed to a larger extent than ${\mathrm{H}}_2(\mathrm{g})$ on activated charcoal.
Reason R: ${\mathrm{SO}}_2(\mathrm{g})$ has …

Match List-I with List-II

List - I (Colloid Preparation method)
(a) Hydrolysis
(b) Reduction
(c) Oxidation
(d) Double Decomposition

List - II (Chemical Reaction)
(i) …

The INCORRECT statements below regarding colloidal solutions is:

The charges on the colloidal CdS sol and ${\mathrm{TiO}}_2$ sol are, respectively:

For the coagulation of a negative sol, the species below, that has the highest flocculating power is:

Match List - I with List - II:

List - I (Process):
(a) Deacon's process
(b) Contact process
(c) Cracking of hydrocarbons
(d) Hydrogenation of vegetable oils

List - II (Catalyst):
(i) ZSM-5
(ii) ${\mathrm{CuCl}}_2$
(iii) Particles 'Ni'
(iv) ${\mathrm{V}}_2{\mathrm{O}}_5$

Choos …

Match List - I with List - II:
List - I (Example of Colloids): (a) Cheese (b) Pumice stone (c) Hair cream (d) Cloud
List - II (Classification): (i) dispersion of liquid in liquid (ii) dispersion of liquid in gas (iii) dispersion of gas in solid (iv) dispersion of liquid i …

The flocculation value of HCl for arsenic sulphide sol is $30\mathrm{m}\mathrm{mol}{\mathrm{L}}^{-1}$. If ${\mathrm{H}}_2{\mathrm{SO}}_4$ is used for the flocculation of arsenic sulphide, the amount, in grams of ${\mathrm{H}}_2{\mathrm{SO}}_4$ in 250 mL required for t …

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :

For the following Assertion and Reason, the correct option is :

Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group …

A mixture of gases ${\mathrm{O}}_2,{\mathrm{H}}_2$ and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is:

Adsorption of a gas follows Freundlich adsorption isotherm. If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent, the correct plot of $\frac{x}{m}$ versus $p$ is:

Tyndall effect is observed when

An ionic micelles is formed on the addition of:

For Freudlich adsorption isotherm, a plot of log(x/m) (y-axis) and log p (x-axis) gives a straight line. The intercept and slope for the line is 0.4771 and 2, respectively. The mass of gas adsorbed per gram of adsorbent if the initial pressure is 0.04 atm, is _____ × 10⁻⁴ g. (log …

Identify the correct molecular picture showing what happens at the critical micellar concentration (CMC) of an aqueous solution of a surfactant
(● polar head; ▬ non-polar tail ; · water).

Kraft temperature is the temperature:

Match the following:

A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :

Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass $m$ of the adsorbent. The plot of $\log \frac{x}{m}$ versus $\log p$ is shown in the given graph, $\frac{x}{m}$ is proportional to:

$0.27\mathrm{g}$ of a long chain fatty acid was dissolved in $100{\mathrm{cm}}^3$ of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch gl …

The aerosol is a kind of colloid in which:

Match the catalysis(Column - I) with products (Column-II)

Column-I (Catalyst):
(a) ${\mathrm{V}}_2{\mathrm{O}}_5$
(b) ${\mathrm{TiCl}}_4/\mathrm{Al}(\mathrm{Me}{)}_3$
(c) ${\mathrm{PdCl}}_2$
(d) Iron oxide

Column-II (Product):
(i) Polyethylene
(ii) Ethanal
(iii) …

Which of the following is not an example of heterogeneous catalytic reaction?

Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is:

Peptization is a :

The correct option among the following is:

An example of solid sol is:

Given

On the basis of data given, predict which of the following gases shows least adsorpti …

Among the following, the INCORRECT statement about colloids is :

Among the following, the false statement is :

10 mL of 1 mM surfactant solution forms a monolayer covering $0.24{\mathrm{cm}}^2$ on a polar substrate. If the polar head is approximated as cube, what is its edge length?

For coagulation of arsenious sulphide sol, which one of the following salt solution will be most effective?

Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of gas adsorbed on mass $m$ of the adsorbent at pressure $p$. $\frac{x}{m}$ is proportional to

A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation


Adsorption of the gas increases with:

The Tyndall effect is observed only when following conditions are satisfied :
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
( …

For a linear plot of $\log (x/m)$ versus $\log p$ in a Freundlich adsorption isotherm, which of the following statements is correct ? ( k and n are constants)

$3\mathrm{g}$ of activated charcoal was added to 50 mL of acetic acid solution ( 0.06 N ) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N . The amount of acetic acid adsorbed (per gram of charcoal) is:

The coagulating power of electrolytes having ions ${\mathrm{Na}}^{+},{\mathrm{Al}}^{3+}$ and ${\mathrm{Ba}}^{2+}$ for arsenic sulphide sol increases in the order:

According to Freundlich adsorption isotherm, which of the following is correct ?

Which of the following statements is incorrect regarding physissorptions ?

Gold numbers of protective colloids $\mathrm{A},\mathrm{B},\mathrm{C}$ and D are $0.50,0.01,0.10$ and 0.005, respectively. The correct order of their protective powers is

In Langmuir's model of adsorption of a gas on a solid surface

The volume of a colloidal particle, $V_C$ as compared to the volume of a solute particle in a true solution $V_S$, could be

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?