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NEET • CHEMISTRY • SOLID STATE

Solid state practice · Mixed difficulty

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Showing 1-30 of 238 questions
1 Easy
1 of 238
Remembering +4 | -1
Schottky defect in crystals is observed when
View answer and explanation
Correct option: D
Equal number of cations and anions are missing from the lattice
Option D (Equal number of cations and anions are missing from the lattice) is correct because Schottky defects involve the absence of an equal number of cations and anions to maintain electrical neutrality, leading to vacancies in the crystal lattice.
2 Medium
2 of 238
Application +4 | -1
Calculate the ionic radius of a Cs+\mathrm{C}{\mathrm{s}^ + } ion, assuming that the cell edge length for CsCl is 0.4123 nm and that the ionic radius of a CI−\mathrm{C}{\mathrm{I}^ - } ion is   0.181  nm\;0.181\,\,nm
View answer and explanation
Correct option: D
0.176nm0.176\mathrm{ }nm
Option D (0.176nm0.176\mathrm{ }nm) is correct because it's the calculated ionic radius of Cs+ based on the given information.
3 Easy
3 of 238
Analyzing +4 | -1
Wrong match is
View answer and explanation
Correct option: B
GaAs - Insulator
Option B (GaAs - Insulator) is the wrong match because GaAs is a semiconductor, not an insulator.
4 Easy
4 of 238
Application +4 | -1
A molecule contains atoms AA and BB such that AA occurs at the corners of the cube and YY at the face centres. The formula of the molecule is
View answer and explanation
Correct option: A
AB3A B_3
Option A (AB3A B_3) is correct because the contribution of A is 1 and the contribution of B is 3.
5 Easy
5 of 238
Analyzing +4 | -1
Which species is diamagnetic ?
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because Ca2+\mathrm{C}{\mathrm{a}^{2 + }}, Hg2Cl2\mathrm{H}{\mathrm{g}_2}\mathrm{C}{\mathrm{l}_2}, and Sb3+\mathrm{S}{\mathrm{b}^{3 + }} all have completely filled electron configurations, making them diamagnetic.
6 Easy
6 of 238
Remembering +4 | -1
The arrangement ABCABC……is referred to as,
View answer and explanation
Correct option: D
Cubic close packing
Option D is correct because the ABCABC... arrangement is characteristic of cubic close packing (ccp), also known as face-centered cubic (fcc).
7 Hard
7 of 238
Application +4 | -1
An alloy of Cu, Ag and Au is found to have Cu forming the simple cubic close packed lattice. If the Ag atoms occupy the face centres and Au is present at the body centre, the formula of the alloy will be
View answer and explanation
Correct option: B
CuAg3Au\mathrm{CuA}{\mathrm{g}_3}\mathrm{Au}
Option B (CuAg3Au\mathrm{CuA}{\mathrm{g}_3}\mathrm{Au}) is correct because it represents the correct ratio of Cu, Ag, and Au atoms in the alloy.
8 Hard
8 of 238
Application +4 | -1
Number of unit cells in 0.97 g0.97 {~g} of ZnS{ZnS} (sphalerite) is
View answer and explanation
Correct option: C
2.5×10−3  NA2.5 \times 10^{-3}\, {~N}_{{A}}
Option C (2.5×10−3  NA2.5 \times 10^{-3}\, {~N}_{{A}}) is correct because it is the number of unit cells calculated from the given mass and molar mass of ZnS.
9 Medium
9 of 238
Remembering +4 | -1
In the unit cell of FCC system, the number of octahedral and tetrahedral holes are
View answer and explanation
Correct option: B
4,8
Option B (4, 8) is correct because in a face-centered cubic (FCC) unit cell, there are 4 octahedral holes and 8 tetrahedral holes.
10 Easy
10 of 238
Remembering +4 | -1
In a closed pack array of NN spheres, the number of tetrahedral holes are
View answer and explanation
Correct option: C
2N2N
Option C (2N2N) is correct because in a closed packed array of N spheres, the number of tetrahedral holes is twice the number of spheres.
11 Medium
11 of 238
Remembering +4 | -1
Which one of the following has Frenkel defect?
View answer and explanation
Correct option: B
AgBr\mathrm{AgBr}
Option B (AgBr) is correct because AgBr exhibits both Schottky and Frenkel defects due to the relatively small size of Ag+ ions, allowing them to occupy interstitial sites.
12 Medium
12 of 238
Application +4 | -1
If AgCl is doped with 10−6{10^{ - 6}} mol% of CdCl2CdC{l_2}, the concentration of cation vacancies will be
View answer and explanation
Correct option: C
6.02×1015 mol−16.02 \times {10^{15}}\,mo{l^{ - 1}}
Option C is correct because each CdCl2CdCl_2 introduces one cation vacancy in AgCl. The concentration of cation vacancies is equal to the concentration of CdCl2CdCl_2 which is 10−6{10^{-6}} mol% of AgCl.
13 Easy
13 of 238
Understanding +4 | -1
Which one of the following defects in the crystals lowers its density?
View answer and explanation
Correct option: B
Schottky defect
Option B (Schottky defect) is correct because Schottky defects involve missing atoms or ions from the lattice, thus decreasing the density of the crystal.
14 Medium
14 of 238
Understanding +4 | -1
In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is
View answer and explanation
Correct option: A
Presence of electrons in the crystal lattice
Option A (Presence of electrons in the crystal lattice) is correct because the yellow color in NaCl crystals is due to F-centers, which are electrons trapped in anion vacancies.
15 Medium
15 of 238
Analyzing +4 | -1
Statement I: NiONiO is expected to have more defects than NaClNaCl.

Statement II: NaClNaCl is an ionic compound.
View answer and explanation
Correct option: B
Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I
Option B (Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I) is correct because NiO has more defects due to higher charge density and NaCl being ionic is a true statement, but not the reason for the defect difference.

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CHEMICAL BONDING & MOLECULAR STRUCTURE 595 MCQs THERMODYNAMICS 583 MCQs STRUCTURE OF ATOM 499 MCQs CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 429 MCQs Equilibrium 412 MCQs STATES OF MATTER 410 MCQs
16 Hard
16 of 238
Analyzing +4 | -1
Assertion (A): If the length of the unit cell of LiClLiCl having NaCl{NaCl} structure is 5.14  A∘,5.14\,\,\mathop {\text{A}}\limits^ \circ , the ionic radius of ion is 4.82  A∘.4.82 \,\,\mathop {\text{A}}\limits^ \circ.

Reason (R): Action-anion contact is retained in LiCl{LiCl} structure because anions constitute the lattice.
View answer and explanation
Correct option: A
Both (A) and (R) are correct and (R) is the correct explanation of (A)
Option A (Both (A) and (R) are correct and (R) is the correct explanation of (A)) is correct because the assertion and reason are both true, and the reason correctly explains why the assertion is true.
17 Medium
17 of 238
Application +4 | -1
In a binary compound, atoms of element AA form a hcp structure and those of element MM occupy 2/32/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is
View answer and explanation
Correct option: B
M4A3{M_4}{A_3}
Option B (M4A3{M_4}{A_3}) is correct because in an HCP structure, the number of tetrahedral voids is twice the number of atoms, and 2/3 of these voids are occupied by M.
18 Hard
18 of 238
Application +4 | -1
The distance between two tetrahedral voids on a body diagonal in a cubic unit cell is : ( a→a \rightarrow edge length)
View answer and explanation
Correct option: B
a32\frac{a \sqrt{3}}{2}
Option B (a32\frac{a \sqrt{3}}{2}) is correct because the tetrahedral voids are located at a quarter of the body diagonal from each corner, and the distance between them is half the body diagonal.
19 Medium
19 of 238
Understanding +4 | -1
6:6  NaCl6:6\,\,NaCl Co-ordination changes to 8:88:8 Co-ordination on
View answer and explanation
Correct option: A
Applying high pressure
Option A (Applying high pressure) is correct because applying high pressure favors structures with higher coordination numbers, causing the 6:6 NaCl coordination to change to 8:8.
20 Medium
20 of 238
Application +4 | -1
If the distance between Na+\mathrm{N}{\mathrm{a}^ + } and CI−\mathrm{C}{\mathrm{I}^ - } ions in NaCl crystal is ‘aa’ pm what is the length of the cell edge?
View answer and explanation
Correct option: C
2a  pm2a\,\,\mathrm{pm}
Option C (2a  pm2a\,\,\mathrm{pm}) is correct because in NaCl, the distance between Na+ and Cl- ions is half the cell edge length.
21 Hard
21 of 238
Application +4 | -1
The no.of tetrahedral voids present in 0.5 mole of hcp crystal structure are
View answer and explanation
Correct option: C
3.6×10243.6 \times {10^{24}}
Option C (3.6×10243.6 \times {10^{24}}) is correct because the number of tetrahedral voids in an HCP structure is twice the number of atoms, and this is scaled by the number of moles.
22 Medium
22 of 238
Understanding +4 | -1
Si doped with Sb is an example of ______ semi conductor. While the one which is doped with Ga is _____ type semi conductor
View answer and explanation
Correct option: A
n – type, p – type
Option A (n – type, p – type) is correct because Si doped with Sb (antimony, group 15) is n-type, and Si doped with Ga (gallium, group 13) is p-type.
23 Easy
23 of 238
Analyzing +4 | -1
Which one is diamagnetic?
View answer and explanation
Correct option: C
F−{\mathrm{F}^ - }
Option C (F−{\mathrm{F}^ - }) is correct because it has a completely filled electron configuration, making it diamagnetic.
24 Medium
24 of 238
Remembering +4 | -1
The structure of Na2O\mathrm{N}{\mathrm{a}_2}\mathrm{O} crystal is
View answer and explanation
Correct option: D
Antifluorite type
Option D (Antifluorite type) is correct because Na2O\mathrm{N}{\mathrm{a}_2}\mathrm{O} has a structure where the positions of cations and anions are reversed compared to the fluorite structure.
25 Easy
25 of 238
Understanding +4 | -1
Which has no rotation of symmetry?
View answer and explanation
Correct option: D
Triclinic
Option D (Triclinic) is correct because a triclinic crystal system has no rotational symmetry other than a 1-fold rotation.
26 Medium
26 of 238
Understanding +4 | -1
Select the incorrect statement
View answer and explanation
Correct option: D
Density of crystal always increases due to substitutional impurity defect
Option D is the incorrect statement because substitutional impurity defects can either increase or decrease the density of the crystal, depending on the mass of the impurity.
27 Easy
27 of 238
Understanding +4 | -1
In a face centred cubic lattice the number of nearest neighbours for a given lattice point are :
View answer and explanation
Correct option: C
12
Option C (12) is correct because in a face-centered cubic lattice, each atom has 12 nearest neighbors.
28 Hard
28 of 238
Remembering +4 | -1
The unit cell parameters of Tetragonal crystal is
View answer and explanation
Correct option: A
a=b≠c,α=β=γ=90∘\mathrm{a}=\mathrm{b} \neq \mathrm{c}, \alpha=\beta=\gamma=90^{\circ}
Option A (a=b≠c,α=β=γ=90∘\mathrm{a}=\mathrm{b} \neq \mathrm{c}, \alpha=\beta=\gamma=90^{\circ}) is correct because it represents the unit cell parameters for a tetragonal crystal system.
29 Medium
29 of 238
Application +4 | -1
A compound is formed by element A and B is cubic. AA atoms are at the corners and BB atoms are at the face centre. What is the formula?
View answer and explanation
Correct option: C
AB3A B_3
Option C (AB3A B_3) is correct because A atoms at the corners contribute 1/8 each, totaling 1, and B atoms at the face centers contribute 1/2 each, totaling 3.
30 Medium
30 of 238
Application +4 | -1
The orthorhombic, the value of a,b,a,b, and cc are respectively 4.2A∘,6.8A∘4.2\mathop \mathrm{A}\limits^ \circ ,6.8\mathop \mathrm{A}\limits^ \circ and 8.3A∘.8.3\mathop \mathrm{A}\limits^ \circ . Given the molecular mass of the solute is 155 g mol−1\mathrm{mo}{\mathrm{l}^{ - 1}} and that of density is 3.3g/cc, the number of formula units per unit cell is
View answer and explanation
Correct option: C
4
Option C is correct because the number of formula units per unit cell (Z) is calculated using the formula Z = (ρ * V * NA) / M, where ρ is density, V is the volume of the unit cell, NA is Avogadro's number, and M is the molecular mass. The result is approximately 4.
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