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The Solid State Class 12 MCQs Questions with Answers
Which of the following transition metal oxides is paramagnetic?
Answer: (b) VO
Which of the following transition metal oxides is not an insulator?
Answer: (c) VO
Coordination number in ccp and hep arrangements of metal atoms are respectively.
(a) 6, 6
(b) 12, 6
(c) 8, 6
(d) 12, 12
Answer: (d) 12, 12
An example of body centered cube is
Answer: (a) Sodium
Fe3O4 is ferrimagnetic at room temperature but at 850 K it becomes
Answer: (d) Paramagnetic
Which of the following is not an example of 13-15 compounds,
Answer: (c) CdSe
For tetrahedral coordination, the radius ration (r+/r ) should be
Answer: (b) 0.225-0.414
A compound formed by elements A and B crystallises in the cubic structure where A atoms are at comers of a cube and B atoms are at face centres. The formula of the compound is
Answer: (a) AB3
How many space lattices are possible in a crystal?
Answer: (d) 14
The number of atoms in bcc arrangement is
Answer: (b) 2
In face-centered cubic unit cell, edge length is
(a) (frac 4√3)r
(b) (frac 4√2)r
(d) (frac √32)r
Answer: (b) (frac 4√2)r
Metallic lustre is explained by
(a) diffusion of metal ions
(b) oscillation of loose electrons
(c) excitation of free protons
(d) existence of bcc lattice.
Answer: (b) oscillation of loose electrons
In a face-centered cubic lattice, unit cell is shared equally by how many unit cells?
Answer: (c) 6
The percentage of iron present as Fe (III) in Fe0.93 O1.0 is
Answer: (b) 7.84%
Which of the following fee structure contains cations in alternate tetrahedral voids? (IIT 2005)
Answer: (b) ZnS
The numbers of tetrahedral voids in the unit cell of a face centered cubic lattice of similar atoms is
Answer: (c) 8
The hardest substance among the following is
Answer: (d) SiC
How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g? (Atomic mass of Na = 213, Cl = 35.5)
(a) 5.14 × 1021
(b) 1.28 × 1021
(c) 1.71 × 1021
(d) 2.57 × 1021
Answer: (d) 2.57 × 1021
What is the coordination number of Cl- in NaCl crystals
Answer: (b) 6
The pyknometric density of sodium chloride crystal is 2.165 × 10³ kg m-3, while its X-ray density is 2.178 × 10³ kg m-3. The fraction of the unoccupied sites in sodium chloride crystal is
(b) 15.96 × 10-2
(c) 5.96 × 10-1
(d) 5.96 × 10-3
Answer: (d) 5.96 × 10-3
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
Answer: (b) 2Z
Which has no rotation of symmetry?
Answer: (d) Triclinic
If the distance between Na+ and Cl– ions in sodium chloride crystal is X pm the length of the edge of the unit cell is
(a) 4X pm
(b) X/4 pm
(c) X/2 pm
(d) 2 × pm
Answer: (d) 2 × pm
Which of the following metal oxides is antiferromagnetic in nature?
Answer: (d) CrO2
The interionic distance for cesium chloride crystal will be
(c) √3 a/2
Answer: (c) √3 a/2
The liquified metal expanding on solidification is
Answer: (a) Ga
The number of unit cells in 58.5 g of NaCl is nearly
(a) 6 × 1020
(b) 3 × 1022
(c) 1.5 × 1023
(d) 0.5 × 1024
Answer: (d) 0.5 × 1024
The number of octahedral sites per sphere in fee structure is
Answer: (d) 1
The crystal system of a compound with unit cell dimensions a = 0.387, b = 0.387 and c – 0.504 nm and α = ß = 90° and γ = 120° is
Answer: (b) Hexagonal
Which type of crystal defect is indicated in the diagram below?
(a) Frenkel defect
(b) Schottky defect
(c) Interstitial defect
(d) Frenkel and Schottky defects.
Answer: (b) Schottky defect
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