Solid State

Question 1

Types of solid

Answer 1

Crystalline solid and amorphous solid

Question 2

Types of crystalline solid

Answer 2

Ionic crystals
Covalent network crystals
Molecular crystals
Metallic crystals

Question 3

Crystal systems

Answer 3

Cubic
Orthorhombic
Tetragonal
Monoclinic
Rhombohedral
Triclinic
Hexagonal

Question 4

Types of cubic lattice (bravais lattice)

Answer 4

Simple cubic or primitive
Body centered cubic
Face centered cubic

Question 5

No of atoms in unit cell

Answer 5

Scc = 1
Bcc = 2
Fcc= 4

Question 6

Packing efficiency in sc (space occupied and void)

Answer 6

Simple cubic
Occupied = 52.4%
Void = 47.6%

Question 7

Packing efficiency in bcc (space occupied and void)

Answer 7

Body centered cubic
Occupied= 68%
Void = 32%

Question 8

Packing efficiency in fcc and hcp (space occupied and void)

Answer 8

Face centered cubic & hexagonal centered cubic
Occupied= 74%
Void= 26%

Question 9

No of tetrahedral void and octahedral void

Answer 9

Tetrahedral void= 2 number of atoms
Octahedral void= number of atoms

Question 10

No of unit cell formula

Answer 10

X / p a^3

Question 11

Formula for number of atoms/particles in X gram

Answer 11

No of atoms in ‘X’ gram = X n/ p a^3

Question 12

Radius formula for scc

Answer 12

r = a/2

Question 13

Radius formula for bcc

Answer 13

r=(√3/4) a

Question 14

Radius formula for fcc

Answer 14

r= a / 2√2

Question 15

Density formula for crystal

Answer 15

P= n × M / Na × a^3
P= mass of unit cell/volume of unit cell

Question 16

Molar mass (M) for crystal

Answer 16

M= p Na a^3 / n

Question 17

Coordination number of atoms in scc

Answer 17

6

Question 18

Coordination number of atoms atoms in bcc

Answer 18

8

Question 19

Coordination number of atoms in fcc/ccp/hcp

Answer 19

12