Surface Chemistry & Solid State · JEE Main previous year questions

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2023 23 questions

Q782023 · 13 Apr 2023 · Shift 2
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. Reason R : The light scatters in all directions when the size of particles is large enough. 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.A is true but R is false
3. C.Both A and R are correct but R is NOT the correct explanation of A
4. D.A is false but R is true
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Answer: A
Q902023 · 13 Apr 2023 · Shift 2· Numerical answer
Sodium metal crystallizes in a body centred cubic lattice with unit cell edge length of $4 \overset{˚}{A}$ . The radius of sodium atom is ____ $\times 1 0^{- 1} \overset{˚}{A}$ (Nearest integer)
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Answer: 17
Q772023 · 11 Apr 2023 · Shift 1
Given below are two statements: Statement-I : Methane and steam passed over a heated $Ni$ catalyst produces hydrogen gas. Statement-II : Sodium nitrite reacts with $N H_{4} Cl$ to give $H_{2} O$ , $N_{2}$ and $NaCl$ . 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 incorrect
3. C.Both the statements I and II are correct
4. D.Statement I is incorrect but Statement II is correct
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Answer: C
Q902023 · 11 Apr 2023 · Shift 1· Numerical answer
An atomic substance A of molar mass $12 g mol^{- 1}$ has a cubic crystal structure with edge length of $300 pm$ . The no. of atoms present in one unit cell of A is _________. (Nearest integer) Given the density of A is $3.0 g mL^{- 1}$ and $N_{A} = 6.02 \times 1 0^{23} mol^{- 1}$
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Answer: 4
Q892023 · 11 Apr 2023 · Shift 2· Numerical answer
The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is __________ A. The catalyst is diffused over the surface of reactants. B. Reactants are adsorbed on the surface of the catalyst. C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate. D. It is a combination of intermediate compound formation theory and the old adsorption theory. E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.
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Answer: 3
Q902023 · 11 Apr 2023 · Shift 2· Numerical answer
$Mg (N O_{3})_{2} \cdot X H_{2} O$ and $Ba (N O_{3})_{2} \cdot Y H_{2} O$ , represent formula of the crystalline forms of nitrate salts. Sum of X and Y is _________.
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Answer: 6
Q652023 · 10 Apr 2023 · Shift 1
Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to :
1. A.prevent hydrolysis
2. B.prevent breaking
3. C.prevent oxidation
4. D.prevent reduction
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Answer: C
Q752023 · 10 Apr 2023 · Shift 1
The enthalpy change for the adsorption process and micelle formation respectively are
1. A. $Δ H_{ads} > 0 and Δ H_{mic} < 0$
2. B. $Δ H_{ads} > 0 and Δ H_{mic} > 0$
3. C. $Δ H_{ads} < 0 and Δ H_{mic} < 0$
4. D. $Δ H_{ads} < 0 and Δ H_{mic} > 0$
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Answer: D
Q782023 · 10 Apr 2023 · Shift 1
Given below are two reactions, involved in the commercial production of dihydrogen ( $H_{2}$ ). The two reactions are carried out at temperature " $T_{1}$ " and " $T_{2}$ ", respectively $C (s) + H_{2} O (g) T_{1} C O (g) + H_{2} (g)$ $C O (g) + H_{2} O (g) T_{2} Catalyst C O_{2} (g) + H_{2} (g)$ The temperatures $T_{1}$ and $T_{2}$ are correctly related as :
1. A. $T_{1} < T_{2}$
2. B. $T_{1} = T_{2}$
3. C. $T_{1} = 100 K, T_{2} = 1270 K$
4. D. $T_{1} > T_{2}$
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Answer: D
Q772023 · 10 Apr 2023 · Shift 2
The correct relationships between unit cell edge length ' $a$ ' and radius of sphere ' $r$ ' for face-centred and body-centred cubic structures respectively are :
1. A. $r = 22 a$ and $3 r = 4 a$
2. B. $r = 22 a$ and $4 r = 3 a$
3. C. $22 r = a$ and $3 r = 4 a$
4. D. $22 r = a$ and $4 r = 3 a$
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Answer: D
Q722023 · 8 Apr 2023 · Shift 1
The water gas on reacting with cobalt as a catalyst forms
1. A.Methanoic acid
2. B.Methanol
3. C.Methanal
4. D.Ethanol
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Answer: B
Q792023 · 8 Apr 2023 · Shift 1
1. A.B, C, D only
2. B.A, B only
3. C.A, B, D only
4. D.A, C, D only
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Answer: C
Q682023 · 8 Apr 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q792023 · 6 Apr 2023 · Shift 1
A compound is formed by two elements X and Y. The element Y forms cubic close packed arrangement and those of element X occupy one third of the tetrahedral voids. What is the formula of the compound?
1. A. $XY_{3}$
2. B. $X_{3} Y_{2}$
3. C. $X_{3} Y$
4. D. $X_{2} Y_{3}$
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Answer: D
Q902023 · 6 Apr 2023 · Shift 2· Numerical answer
Number of crystal systems from the following where body centred unit cell can be found, is ____________. Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic
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Answer: 3
Q772023 · 1 Feb 2023 · Shift 1
1. A.B only
2. B.A and B only
3. C.A only
4. D.B and C only
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Answer: C
Q782023 · 31 Jan 2023 · Shift 1
1. A.d
2. B.a
3. C.c
4. D.b
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Answer: B
Q772023 · 31 Jan 2023 · Shift 2
Match List I with List II | LIST I | LIST II | | :--- | :--- | | A. Physisorption | I. Single Layer Adsorption | | B. Chemisorption | II. $20 - 40 kJ mol^{- 1}$ | | C. $N_{2} (g) + 3 H_{2} (g) Fe (s) 2 NH_{3} (g)$ | 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
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Answer: C
Q782023 · 29 Jan 2023 · Shift 1
Which of the following salt solutions would coagulate the colloid solution formed when $FeC l_{3}$ is added to $NaOH$ solution, at the fastest rate?
1. A.10 mL of 0.15 $mol d m^{- 3}$ $CaC l_{2}$
2. B.10 mL of 0.2 $mol d m^{- 3}$ $AlC l_{3}$
3. C.10 mL of 0.1 $mol d m^{- 3}$ $N a_{2} S O_{4}$
4. D.10 mL of 0.1 $mol d m^{- 3}$ $C a_{3} (P O_{4})_{2}$
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Answer: B
Q812023 · 29 Jan 2023 · Shift 1· Numerical answer
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Answer: 6
Q622023 · 29 Jan 2023 · Shift 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
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Answer: A
Q772023 · 29 Jan 2023 · Shift 2
Match List I and List II $A. B. C. D. List I Osmosis Reverse osmosis Electro osmosis Electrophoresis I. II. III. IV. List II Solvent molecules pass through semi permeable membrane towards solvent side. Movement of charged colloidal particles under the influence of applied electric potential towards oppositely charged electrodes. Solvent molecules pass through semi permeable membrane towards solution side. Dispersion medium moves in an electric field.$ 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
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Answer: A
Q892023 · 29 Jan 2023 · Shift 2· Numerical answer
A metal M forms hexagonal close-packed structure. The total number of voids in $0.02 mol$ of it is ____ $\times 1 0^{21}$ (Nearest integer). (Given $N_{A} = 6.02 \times 1 0^{23}$ )
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Answer: 36