Solid State

Question 1

Anisotropy of Amorphous solid

Answer 1

Isotropic in nature

Question 2

Anisotropy of Crystalline solid

Answer 2

Anisotropic in nature

Question 3

Possible variation, axial distance, axial angle, example of cubic crystal system

Answer 3

Primitive,BCC,FCC
a=b=c
α= β =γ=90°
NaCl, Zinc Blende,Cu

Question 4

Possible variation, axial distance, axial angle, example of Tetragonal

Answer 4

Primitive, BCC
a=b=c
α= β =γ=90°
White tin, SnO2, TiO2, CaSO4

Question 5

Possible variation, axial distance, axial angle, example of Orthorhombic

Answer 5

Primitive BCC FCC ECC
a≠b≠c
α= β =γ=90°
Rhombic sulphur,KNO3,BaSO4

Question 6

Possible variation, axial distance, axial angle, example of Hexagonal

Answer 6

Primitive
a=b≠c
α= β =90°, γ=120°
Graphite, ZnO, CdS

Question 7

Possible variation, axial distance, axial angle, example of Rhombohedral/Trigonal

Answer 7

Primitive
a=b=c
α= β =γ≠90°
Calcite(CaCO3),HgS(cinnabar)

Question 8

Possible variation, axial distance, axial angle, example of Monoclinic

Answer 8

Primitive,ECC
a≠b≠c
α= γ=90°≠β
Monoclinic Sulphur, NaSO4.10H2O

Question 9

Possible variation, axial distance, axial angle, example of Triclinic

Answer 9

Primitive
a≠b≠c
α≠β≠γ≠90°
K2Cr2O7, CuSO4.5H2O, H3BO3

Question 10

Density formula

Answer 10

d=ZM/a³Nà

Question 11

Efficiency of simple cubic

Answer 11

π/6 or 52.4%

Question 12

Efficiency of BCC

Answer 12

√3/8 or 68%

Question 13

Efficiency of FCC

Answer 13

√2/6 or 74%

Question 14

Z for simple cubic

Answer 14

1

Question 15

Z for FCC

Answer 15

4

Question 16

Z for BCC

Answer 16

2

Question 17

a→r rp for simple cubic

Answer 17

a = 2r

Question 18

a→r rp for FCC

Answer 18

a = 2√2r

Question 19

a→r rp for BCC

Answer 19

a = √3/4r