Surface Chemistry & Solid State · JEE Main previous year questions

2022 13 questions

1. Q902022 · 29 Jul 2022 · Shift 1· Numerical answer

   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)

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   Answer: 566

2. Q902022 · 28 Jul 2022 · Shift 1· Numerical answer

   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)

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   Answer: 22

3. Q712022 · 28 Jul 2022 · Shift 2

   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
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   Answer: A

4. Q882022 · 28 Jul 2022 · Shift 2· Numerical answer

   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, $\mathrm{M}=9.03\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$ )

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   Answer: 87

5. Q902022 · 28 Jul 2022 · Shift 2· Numerical answer
   
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   Answer: 3

6. Q752022 · 27 Jul 2022 · Shift 2

   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
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   Answer: C

7. Q622022 · 26 Jul 2022 · Shift 1

   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.$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{I})$
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   Answer: B

8. Q892022 · 30 Jun 2022 · Shift 1· Numerical answer

   $100\text{ mL}$ 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 $=60{\text{ g mol}}^{-1}$)

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   Answer: 13125

9. Q732022 · 28 Jun 2022 · Shift 2

   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)
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   Answer: C

10. Q712022 · 27 Jun 2022 · Shift 1

    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)
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    Answer: A

11. Q902022 · 27 Jun 2022 · Shift 1· Numerical answer

    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)

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    Answer: 85

12. Q752022 · 25 Jun 2022 · Shift 1

    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.
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    Answer: B

13. Q892022 · 24 Jun 2022 · Shift 2· Numerical answer

    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.

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    Answer: 2