Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

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Q.1. Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?    (2020)
(1) AgBr
(2) CsCl
(3) KBr
(4) ZnS
Ans. (1)
In AgBr, there in not very large difference between the size of the cation and anion, thus, it will show both Frenkel and Schottky defect in crystalline form.

Q.2. At 100°C, copper (Cu) has FCC unit cell structure with cell edge length of x Å. What is the approximate density of Cu (in g cm-3) at this temperature?
[Atomic Mass of Cu = 63.55 u]    (2019)
(1) 205/x3
(2) 105/x3
(3) 211/x3
(4) 422/x3
Ans.
(4)
We know that,
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Given that: Z = 4(fcc)
M= 63.5 g
NA = 6 × 1023 
a = x × 10-8cm
After putting the values, we get
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.3. Which primitive unit cell has unequal edge lengths (a ≠ b ≠ c) and all axial angles different from 90°?    (2019)
(1) Triclinic 
(2) Hexagonal
(3) Monoclinic
(4) Tetragonal
Ans.
(1)
For triclinic crystal
a ≠ b ≠ c Edge lengths
α ≠ β ≠ γ Axial angle

Q.4. A compound of formula A2B3 has the hep lattice. Which atom forms the hep lattice and what fraction of tetrahedral voids is occupied by the other atoms:    (2019)
(1) hep lattice - A, 2/3 Tetrahedral voids - B
(2) hep lattice - A, 1/3 Tetrahedral voids - B
(3) hep lattice - B, 2/3 Tetrahedral voids - A
(4) hep lattice - B, 1/3 Tetrahedral voids - A
Ans. 
(4)
Here, A2B3 can also be written as A4B6.
Thus, hep has six atoms so, ‘B’ forms hep lattice and ‘A’ is present in tetrahedral void.
Total tetrahedral voids = 12
∴ Fraction of tetrahedral voids occupied by A = 4/12 = 1/3

Q.5. A solid having density of 9 x 103 kg m-3 forms face centred cubic crystals of edge length 200√2 pm. What is the molar mass of the solid?
[Avogadro constant ≈ 6 x 1023 mol-1, π ≈ 3]    (2019)

(1) 0.0432 kg mol-1 
(2) 0.0216 kg mol-1 
(3) 0.0305 kg mol-1 
(4) 0.4320 kg mol-1
Ans.
(3)
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
M = 305.4 x 10-4 = 0.0305 kg/mol

Q.6. The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is:
(Edge length is represented by ‘a’)    (2019)
(1) 0.027 a
(2) 0.047 a
(3) 0.134 a
(4) 0.067 a
Ans.
(4)
For BCC
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
∴ Empty space at edge = a - 2R
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.7. Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is:    (2019)
(1) A2BO4 
(2) AB2O4 
(3) A2B2O
(4) A4B2O
Ans.
(2)
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.8. Consider the bcc unit cells of the solids 1 and 2 with the position of atoms are shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?    (2019)
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
(1) 45%
(2) 75%
(3) 90%
(4) 65%
Ans.
(3)
Volume occupied by atoms in solid 2
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Relationship between body diagonal and radius of atom (r),
6r = √3 a
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.9. An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is:    (2019)
(1) √2a
(2) a
(3) a/2
(4) 3/2 a
Ans. 
(3)
In FCC, tetrahedral voids are located on the body diagonal at a distance of √3a/4 from the corner. Together they form a smaller cube of edge length a/2. Therefore, distance between centres of two nearest tetrahedral voids in the lattice is also a/2.

Q.10. The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively:    (2019)
(1) 8 : 1 : 6
(2) 1 : 2 : 4
(3) 4 : 2 : 1 
(4) 4 : 2 : 3
Ans.
(2)
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev 

Q.11. 10 mL of 1 mM surfactant solution forms a monolayer covering 0.24 cm2 on a polar substrate. If the polar head is approximated as a cube, what is its edge length?    (2019)
(1) 1.0 pm
(2) 2.0 pm
(3) 0.1 nm
(4) 2.0 nm
Ans. 
(2)
No. of surfactant molecules = 6 × 1023 × 10/1000 × 10-3 = 6 × 1018 molecule
Let edge length = a cm
Total surface area of surfactant = 6 × 1018 a2 = 0.24 cm2
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.12. Which type of ‘defect’ has the presence of cations in the interstitial sites?    2018
(1) Schottky defect 
(2) Vacancy defect 
(3) Frenkel defect 
(4) Metal deficiency defect 
Ans.
(3)
In Frenkel defect, smaller ion displaces from its actual lattice site into the interstitial sites.

Q.13. Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?    (2018)
(1) Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
(2) Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
(3) Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
(4) Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Ans. 
(4)
Basic knowledge of Antiferromagnetic
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev

Q.14. A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a', the closest approach between two atoms in metallic crystal will be    (2017)
(1) 2a
(2) 2√2a
(3) √2a
(4) a/√2
Ans.
(4)
In FCC, one of the face is like
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
By ΔABC,
2a2 = 16r2
Previous year Questions (2016-20) - The Solid State & Surface Chemistry Notes | EduRev
Distance of closest approach = 2r = a/√2

Q.15. Which of the following compounds is metallic and ferromagnetic?    (2016)
(1) TiO2
(2) CrO2
(3) VO2
(4) MnO2
Ans.
(2)
CrO2 is metallic and ferromagnetic in nature.

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