CBSE Class 12 Chemistry Solid State Worksheet Set A

Important Questions for NCERT Class 12 Chemistry Solid State

Question. Gold has a face centred cubic lattice with an edge length of the unit cube of 407 pm. Assuming the closest packing, the diameter of the gold atom is
(a) 576.6 pm
(b) 287.8 pm 
(c) 352.5 pm
(d) 704.9 pm

Answer :  B

Question. Which is not correct about the Schottky defects?
(a) Both cations and anions are missing from their lattice sites without affecting the stoichiometry of the compound
(b) Because of presence of holes the lattice energy decreases.
(c) The presence of holes causes the density of the crystal to decrease.
(d) The defect increases the electrical conductivity of the solid due to migration of the ions into the holes.

Answer :  B

Question. Schottky defect defines imperfection in the lattice structure of 
(a) solid
(b) gas
(c) liquid
(d) plasma

Answer :  A

Question. An AB2 type structure is found in
(a) NaCl
(b) CaF²
(c) Al²O³
(d) N²O

Answer :  B

Question. An element (atomic mass 100 g/mol) having bcc structure has unit cell edge 400 pm. The density of element is (No. of atoms in bcc, Z = 2). 
(a) 2.144 g/cm³
(b) 7.289 g/cm³
(c) 5.188 g/cm³
(d) 10.376 g/cm³

Answer :  C

Question. What is the coordination number of sodium in Na2O? 
(a) 6
(b) 4
(c) 8
(d) 2

Answer :  B

Question. The crystal system of a compound with unit cell dimensions "a = 0.387, b = 0.387 and c = 0.504 nm and α = β = 90° and γ = 120°" is : 
(a) cubic
(b) hexagonal
(c) orthorhombic
(d) rhombohedral

Answer :  B

Question. If z is the number of atoms in the unit cell that represents the closest packing sequence ..... ABC ABC ......, the number of tetrahedral voids in the unit cell is equal to :
(a) z
(b) 2z
(c) z/2
(d) z/4

Answer :  B

Question. The compound, found in nature in gas phase but ionic in solid state is : 
(a) PCl₅
(b) CCl₄
(c) PCl₃
(d) POCl₃

Answer :  A

Question. The Ca²⁺ and F– are located in CaF2 crystal, respectively at face centred cubic lattice points and in 
(a) Tetrahedral voids
(b) Half of tetrahedral voids
(c) Octahedral voids
(d) Half of octahedral voids

Answer :  A

Question. The coordination number in hcp is 
(a) 6
(b) 12
(c) 18
(d) 24

Answer :  B

Question. The space lattice of graphite is 
(a) Cubic
(b) Tetragonal
(c) Rhombic
(d) Hexagonal

Answer :  D

Question. Coordination numbers of Zn²⁺ and S^2– in the crystal structure of wurtzite are 
(a) 4, 4
(b) 6, 6
(c) 8, 4
(d) 8, 8

Answer :  A

Question. If AgI crystallises in zinc blende structure with I– ions at lattice points. What fraction of tetrahedral voids is occupied by Ag+ ions?
(a) 25%
(b) 50%
(c) 100%
(d) 75%

Answer :  B

Question. Which set of following characteristics for ZnS crystal is correct? 
(a) Coordination number (4 : 4); ccp; Zn²⁺ ion in the alternate tetrahedral voids
(b) Coordination number (6 : 6); hcp; Zn²⁺ ion in all tetrahedral voids.
(c) Coordination number (6 : 4); hcp; Zn²⁺ ion in all octahedral voids
(d) Coordination number (4 : 4); ccp; Zn²⁺ ion in all tetrahedral voids.

Answer :  A

Question. Molecules/ions and their magnetic properties are given below. 
Molecule/ion Magnetic property
(i) C6H6 (1) Antiferromagnetic
(ii) CrO2 (2) Ferrimagnetic
(iii) MnO (3) Ferromagnetic
(iv) Fe3O4 (4) Paramagnetic
(v) Fe3+ (5) Diamagnetic
The correctly matched pairs in the above is
(a) i-5, ii-3, iii-2, iv-1, v-4
(b) i-3, ii-5, iii-1, iv-4, v-2
(c) i-5, ii-3, iii-1, iv-2, v-4
(d) i-5, ii-3, iii-1, iv-4, v-2

Answer :  C

Question. Which one of the following statements about packing in solids is incorrect ?
(a) Coordination number in bcc mode of packing is 8.
(b) Coordination number in hcp mode of packing is 12.
(c) Void space in hcp mode of packing is 32%.
(d) Void space is ccp mode of packing is 26%.

Answer :  C

Question. Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29Å. The radius of sodium atom is approximately : 
(a) 5.72Å
(b) 0.93Å
(c) 1.86Å
(d) 3.22Å

Answer :  C

Question. The existence of a substance in more than one solid modifications is known as 
(a) isomorphism
(b) Polymorphism
(c) Amorphism
(d) Allotropy

Answer :  B

Question. An element (atomic mass = 100 g / mol) having bcc structure has unit cell edge 400 pm. Then, density of the element is 
(a) 10.376 g/cm³
(b) 5.188 g/cm³
(c) 7.289 g/cm³
(d) 2.144 g/cm³

Answer :  B

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