Surface Chemistry & Solid State · JEE Main previous year questions

1. A.d
2. B.a
3. C.c
4. D.b

Match List I with List II | LIST I | LIST II | | :--- | :--- | | A. Physisorption | I. Single Layer Adsorption | | B. Chemisorption | II. $20-40{\text{ kJ mol}}^{-1}$ | | C. ${\mathrm{N}}_2(\text{g})+3{\mathrm{H}}_2(\text{g})\stackrel{\mathrm{Fe}(\mathrm{s})}{\to }2{\mathrm{NH}}_3(\text{g})$ | III. Chromatography | | D. Analytical Application or Adsorption | IV. Heterogeneous catalysis | Choose the correct answer from the options given below:

1. A.A - III, B - IV, C - I, D - II
2. B.A - II, B - III, C - I, D - IV
3. C.A - II, B - I, C - IV, D - III
4. D.A - IV, B - II, C - III, D - I

Which of the following salt solutions would coagulate the colloid solution formed when $\mathrm{FeC}{\mathrm{l}}_3$ is added to $\mathrm{NaOH}$ solution, at the fastest rate?

1. A.10 mL of 0.15 $\mathrm{mol}\mathrm{d}{\mathrm{m}}^{-3}$ $\mathrm{CaC}{\mathrm{l}}_2$
2. B.10 mL of 0.2 $\mathrm{mol}\mathrm{d}{\mathrm{m}}^{-3}$ $\mathrm{AlC}{\mathrm{l}}_3$
3. C.10 mL of 0.1 $\mathrm{mol}\mathrm{d}{\mathrm{m}}^{-3}$ $\mathrm{N}{\mathrm{a}}_2\mathrm{S}{\mathrm{O}}_4$
4. D.10 mL of 0.1 $\mathrm{mol}\mathrm{d}{\mathrm{m}}^{-3}$ $\mathrm{C}{\mathrm{a}}_3(\mathrm{P}{\mathrm{O}}_4{)}_2$

Given below are two statements : Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon forms both electron rich and electron deficient hydrides. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A.Statement I is correct but statement II is incorrect
2. B.Both the statements I and II are correct
3. C.Both the statements I and II are incorrect
4. D.Statement I is incorrect but statement II is correct

Match List I and List II $$\begin{array}{llll}& \text{List I}& & \text{List II}\\ \text{A.}& \text{Osmosis}& \text{I.}& \text{Solvent molecules pass through semi permeable membrane towards solvent side.}\\ \text{B.}& \text{Reverse osmosis}& \text{II.}& \text{Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.}\\ \text{C.}& \text{Electro osmosis}& \text{III.}& \text{Solvent molecules pass through semi permeable membrane towards solution side.}\\ \text{D.}& \text{Electrophoresis}& \text{IV.}& \text{Dispersion medium moves in an electric field.}\end{array}$$ Choose the correct answer from the options given below :

1. A.A-III, B-I, C-IV, D-II
2. B.A-III, B-I, C-II, D-IV
3. C.A-I, B-III, C-IV, D-II
4. D.A-I, B-III, C-II, D-IV

A metal M forms hexagonal close-packed structure. The total number of voids in $0.02\mathrm{mol}$ of it is ____ $\times 10^{21}$ (Nearest integer). (Given ${\mathrm{N}}_{\mathrm{A}}=6.02\times 10^{23}$)

Ionic radii of cation ${\mathrm{A}}^{+}$ and anion ${\mathrm{B}}^{-}$ are $102$ and $181\mathrm{pm}$ respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for ${\mathrm{B}}^{-}$. ${\mathrm{A}}^{+}$ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is ________ $\mathrm{pm}$. (Nearest Integer)

An element M crystallises in a body centred cubic unit cell with a cell edge of $300\text{ pm}$. The density of the element is $6.0{\text{ g cm}}^{-3}$. The number of atoms present in $180\text{ g}$ of the element is _________ $\times 10^{23}$. (Nearest integer)

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin layer chromatography is an adsorption chromatography. Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below

1. A.Both A and R are true and R is the correct explanation of A
2. B.Both A and R are true but R is NOT the correct explanation of A
3. C.A is true but R is false
4. D.A is false but R is true

Metal $\mathrm{M}$ crystallizes into a fcc lattice with the edge length of $4.0\times 10^{-8}\mathrm{cm}$. The atomic mass of the metal is ____ $g/mol$. (Nearest integer) ( Use : ${\mathrm{N}}_{\mathrm{A}}=6.02\times 10^{23}\mathrm{mo}{\mathrm{l}}^{-1}$ , density of metal, $\mathrm{M}=9.03\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$ )

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper. Reason (R) : Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper. In the light of the above statements, choose the correct answer from the options given below :

1. A.Both (A) and (R) are correct and (R) is the correct explanation of (A)
2. B.Both (A) and (R) are correct but (R) is not the correct explanation of (A)
3. C.(A) is correct but (R) is not correct
4. D.(A) is not correct but (R) is correct

Match List - I with List - II. $$\begin{array}{llll}& \text{List I}& & \text{List II}\\ & \text{(Processes / Reactions)}& & \text{(Catalyst)}\\ \text{(A)}& 2\mathrm{S}{\mathrm{O}}_2(\mathrm{g})+{\mathrm{O}}_2(\mathrm{g})\to 2\mathrm{S}{\mathrm{O}}_3(\mathrm{g})& \text{(I)}& \mathrm{Fe}(\mathrm{s})\\ \text{(B)}& 4\mathrm{N}{\mathrm{H}}_3(\mathrm{g})+5{\mathrm{O}}_2(\mathrm{g})\to 4\mathrm{NO}(\mathrm{g})+6{\mathrm{H}}_2\mathrm{O}(\mathrm{g})& \text{(II)}& \mathrm{Pt}(\mathrm{s})-\mathrm{Rh}(\mathrm{s})\\ \text{(C)}& {\mathrm{N}}_2(\mathrm{g})+3{\mathrm{H}}_2(\mathrm{g})\to 2\mathrm{N}{\mathrm{H}}_3(\mathrm{g})& \text{(III)}& {\mathrm{V}}_2{\mathrm{O}}_5\\ \text{(D)}& \text{Vegetable oil(l)}+{\mathrm{H}}_2\to \text{Vegetable ghee(s)}& \text{(IV)}& \mathrm{Ni}(\mathrm{s})\end{array}$$ Choose the correct answer from the options given below :

1. A.$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{IV})$
2. B.$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{IV})$
3. C.$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{III}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{II})$
4. D.$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{I})$

$100\text{ mL}$ of $0.3\text{ M}$ acetic acid is shaken with $0.8\text{ g}$ of wood charcoal. The final concentration of acetic acid in the solution after adsorption is $0.125\text{ M}$. The mass of acetic acid adsorbed per gram of carbon is ___________ $\times 10^{-4}\text{ g}$. (Given : Molar mass of acetic acid $=60{\text{ g mol}}^{-1}$)

Match List - I with List - II : $$\begin{array}{llll}& \text{List-I}& & \text{List-II}\\ \text{(A)}& \text{negatively charged sol}& \text{(I)}& \mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3\cdot x{\mathrm{H}}_2\mathrm{O}\\ \text{(B)}& \text{macromolecular colloid}& \text{(II)}& \text{CdS sol}\\ \text{(C)}& \text{positively charged sol}& \text{(III)}& \text{Starch}\\ \text{(D)}& \text{Cheese}& \text{(IV)}& \text{a gel}\end{array}$$ Choose the correct answer from the options given below:

1. A.(A) - (II), (B) - (III), (C) - (IV), (D) - (I)
2. B.(A) - (II), (B) - (I), (C) - (III), (D) - (IV)
3. C.(A) - (II), (B) - (III), (C) - (I), (D) - (IV)
4. D.(A) - (I), (B) - (III), (C) - (II), (D) - (IV)

Match List-I with List-II $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(A)}& \text{Lyophilic colloid}& \text{(I)}& \text{Liquid-liquid colloid}\\ \text{(B)}& \text{Emulsion}& \text{(II)}& \text{Protective colloid}\\ \text{(C)}& \text{Positively charged colloid}& \text{(III)}& \mathrm{FeC}{\mathrm{l}}_3+\mathrm{NaOH}\\ \text{(D)}& \text{Negatively charged colloid}& \text{(IV)}& \mathrm{FeC}{\mathrm{l}}_3+\text{hot water}\end{array}$$ Choose the correct answer from the options given below :

1. A.(A) - (II), (B) - (I), (C) - (IV), (D) - (III)
2. B.(A) - (III), (B) - (I), (C) - (IV), (D) - (II)
3. C.(A) - (II), (B) - (I), (C) - (III), (D) - (IV)
4. D.(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

Metal deficiency defect is shown by $\mathrm{F}{\mathrm{e}}_{0.93}\mathrm{O}$. In the crystal, some $\mathrm{F}{\mathrm{e}}^{2+}$ cations are missing and loss of positive charge is compensated by the presence of $\mathrm{F}{\mathrm{e}}^{3+}$ ions. The percentage of $\mathrm{F}{\mathrm{e}}^{2+}$ ions in the $\mathrm{F}{\mathrm{e}}_{0.93}\mathrm{O}$ crystals is ____. (Nearest integer)

Incorrect statement for Tyndall effect is :

1. A.The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
2. B.The diameter of the dispersed particles is much smaller than the wavelength of the light used.
3. C.During projection of movies in the cinemas hall, Tyndall effect is noticed.
4. D.It is used to distinguish a true solution from a colloidal solution.

When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of acetic acid adsorbed per gram of carbon is ____________ g.

The sol given below with negatively charged colloidal particles is :

1. A.$\mathrm{FeC}{\mathrm{l}}_3$ added to hot water
2. B.$\mathrm{KI}$ added to $\mathrm{AgN}{\mathrm{O}}_3$ solution
3. C.$\mathrm{AgN}{\mathrm{O}}_3$ added to $\mathrm{KI}$ solution
4. D.$\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3\cdot \mathrm{x}{\mathrm{H}}_2\mathrm{O}$ in water

Sodium stearate $\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{16}\mathrm{CO}{\mathrm{O}}^{-}\mathrm{N}{\mathrm{a}}^{+}$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following :

1. A.It forms spherical micelles with $\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{16}$ - group pointing towards the centre of sphere.
2. B.It forms non-spherical micelles with $-\mathrm{CO}{\mathrm{O}}^{-}$ group pointing outwards on the surface.
3. C.It forms spherical micelles with $\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{16}$ - group pointing outwards on the surface of sphere
4. D.It forms non-spherical micelles with $\mathrm{C}{\mathrm{H}}_3(\mathrm{C}{\mathrm{H}}_2{)}_{16}$ - group pointing towards the centre.

Match List I with List II : $$\begin{array}{ll}\text{List-I Example of colloids}& \text{List - II Classification}\\ \text{(a) Cheese}& \text{(i) dispersion of liquid in liquid}\\ \text{(b) Pumice stone}& \text{(ii) dispersion of liquid in gas}\\ \text{(c) Hair cream}& \text{(iii) dispersion of gas in solid}\\ \text{(d) Cloud}& \text{(iv) dispersion of liquid in solid}\end{array}$$ Choose the most appropriate answer from the options given below

1. A.(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. B.(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
3. C.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4. D.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be $7.62\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$. The molar mass of copper complex is ____ $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. (Nearest integer) [Given : $N_A=6.022\times 10^{23}\mathrm{mo}{\mathrm{l}}^{-1}$]

The conditions given below are in the context of observing Tyndall effect in colloidal solutions : (A) The diameter of the colloidal particles is comparable to the wavelength of light used. (B) The diameter of the colloidal particles is much smaller than the wavelength of light used. (C) The diameter of the colloidal particles is much larger than the wavelength of light used. (D) The refractive indices of the dispersed phase and the dispersion medium are comparable. (E) The dispersed phase has a very different refractive index from the dispersion medium. Choose the most appropriate conditions from the options given below :

1. A.(A) and (E) only
2. B.(C) and (D) only
3. C.(A) and (D) only
4. D.(B) and (E) only