CRYSTALLINE & AMORPHOUS SOLID CLASSIFICATION OF CRYSTALLINE SOLID UNIT CELL DENSITY OF UNIT CELL
RADIUS & EDGE LENGTH
Constituent Attractive Propersties Examples
zxM
Name
crystalline solid amorphous solid Force
Particles
Ionic Ions ,High
Brittle NaCl,KCl, =a 3 x N Simple Cube r = a 2
01 02 03 04
melting point, LiCl, etc. A BCC r = √3a √
FCC r = 2 2
a
Solid 4
heat & electricty
Constituent particles are Constituent particles are Hard, High
arranged in a regular, repe- arranged in an irregular, Covalent Atoms Covalent Diamond, PACKING EFFICIENCY
ating & alternating manner random manner Solid
bondmelting point,Graphite,
True solid Pseudo solid or
Packing efficiency
super cooled liquid MolecularMoleculesInter Soft, low
Long range order Short range order Solid
molecularmelting point,Naphthaline,
52.3%
Gives regular cleavage on
force of poor conductors ofDry ice,
camphor, etc 68%
Gives an irregular cleavage attraction heat & electricty bcc 74%
cutting
Metallic bondSoft - hard, All metals
1
}per unit cell
fcc
1 1
on cutting Metallic Cations & Corner Facecenter contribution
Anisotropic
Solid Mobile
good
heat &conductors
low
electricty of
m.p- high m.p,
Sharp melting point Isotropic Body center 1 Edge center
electrons
NaCI, Diamond, Ice etc.
4
Range of melting point
Plastic, Rubber, Glass etc.
Q. An element has a bcc structure with a cell
Q. Which of the following is a pseudo solid? Q. Which one has the highest melting point? Q. How many formula units are there in the edge length of 288pm. The atomic radius is:
unit cell of sodium chloride having (A) √ 2 x 288pm (B) 4 x 288pm
AMU MED 2009
(A) CaF2 (B) Glass (A) Ionic crystal (B) Molecular crystal
FCC structure
√3
4
AFMC 2010
AFMC 2003
NEET 2020
(C) NaCl (D) All of these (C) Covalent crystal (D) Metallic crystal (A) 2 (B) 4 (C) 6 (D) 8 √3
(C) 4 x 288pm (D) 4 x 288pm
ANS : B
ANS : C ANS : B
ANS : D
SOLID STATE
CLOSE PACKING
1- D ELECTRICAL & MAGNETIC PROPERTIES CRYSTAL DEFECT CRYSTAL SYSTEM
Schottky defect Frenkel defect
2. Electrical
2. Non-stoichiometricmetal excess defect metal deficiency defect
05 07 08
ferro magnetic anti ferro magnetic06
2- D Q. Which is the incorrect statement?
(A) Density decreases in case of crystals
Q. Silicon doped with arsenic is an example of
ferri magnetic
3- D which type of semiconductor?
NUMBER OF OCTAHEDRAL VOID = N
NUMBER OF TETRAHEDRAL VOID = 2N (B) n-type
(C) n, p-type (D) Intrinsic
Q. A compound is formed by cation C and anion A. with Schottky defect.
The anions form hcp lattice & the cations occupy
(A) p-type
ANS :B Q. The correct option for the number of body centred
75% of octahedral voids. The formula of the compound is (B) NaCl is insulator, silicon is semiconductor, silver is unit cells in all 14 types of Bravais lattice unit cells is
conductor,quartzispiezoelectriccrystal.
(A) C4A3 (B) C2A3 (C) C3A2 (D) C3A4
(A) 7 (B) 5 (C) 2 (D) 3
(C) Frenkel defect is favoured in those ionic compounds in
AIIMS 2011
which sizes of cation and anions are almost equal.
NEET 2019
NEET 2017
NEET 2021
ANS : D ANS : D
(D) FeO has non-stoichiometric metal deficiency defect. In 14 types of Bravais lattices, BCC is present in
cubic, tetragonal and orthorhombic crystal systems
ANS : C
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RADIUS & EDGE LENGTH
Constituent Attractive Propersties Examples
zxM
Name
crystalline solid amorphous solid Force
Particles
Ionic Ions ,High
Brittle NaCl,KCl, =a 3 x N Simple Cube r = a 2
01 02 03 04
melting point, LiCl, etc. A BCC r = √3a √
FCC r = 2 2
a
Solid 4
heat & electricty
Constituent particles are Constituent particles are Hard, High
arranged in a regular, repe- arranged in an irregular, Covalent Atoms Covalent Diamond, PACKING EFFICIENCY
ating & alternating manner random manner Solid
bondmelting point,Graphite,
True solid Pseudo solid or
Packing efficiency
super cooled liquid MolecularMoleculesInter Soft, low
Long range order Short range order Solid
molecularmelting point,Naphthaline,
52.3%
Gives regular cleavage on
force of poor conductors ofDry ice,
camphor, etc 68%
Gives an irregular cleavage attraction heat & electricty bcc 74%
cutting
Metallic bondSoft - hard, All metals
1
}per unit cell
fcc
1 1
on cutting Metallic Cations & Corner Facecenter contribution
Anisotropic
Solid Mobile
good
heat &conductors
low
electricty of
m.p- high m.p,
Sharp melting point Isotropic Body center 1 Edge center
electrons
NaCI, Diamond, Ice etc.
4
Range of melting point
Plastic, Rubber, Glass etc.
Q. An element has a bcc structure with a cell
Q. Which of the following is a pseudo solid? Q. Which one has the highest melting point? Q. How many formula units are there in the edge length of 288pm. The atomic radius is:
unit cell of sodium chloride having (A) √ 2 x 288pm (B) 4 x 288pm
AMU MED 2009
(A) CaF2 (B) Glass (A) Ionic crystal (B) Molecular crystal
FCC structure
√3
4
AFMC 2010
AFMC 2003
NEET 2020
(C) NaCl (D) All of these (C) Covalent crystal (D) Metallic crystal (A) 2 (B) 4 (C) 6 (D) 8 √3
(C) 4 x 288pm (D) 4 x 288pm
ANS : B
ANS : C ANS : B
ANS : D
SOLID STATE
CLOSE PACKING
1- D ELECTRICAL & MAGNETIC PROPERTIES CRYSTAL DEFECT CRYSTAL SYSTEM
Schottky defect Frenkel defect
2. Electrical
2. Non-stoichiometricmetal excess defect metal deficiency defect
05 07 08
ferro magnetic anti ferro magnetic06
2- D Q. Which is the incorrect statement?
(A) Density decreases in case of crystals
Q. Silicon doped with arsenic is an example of
ferri magnetic
3- D which type of semiconductor?
NUMBER OF OCTAHEDRAL VOID = N
NUMBER OF TETRAHEDRAL VOID = 2N (B) n-type
(C) n, p-type (D) Intrinsic
Q. A compound is formed by cation C and anion A. with Schottky defect.
The anions form hcp lattice & the cations occupy
(A) p-type
ANS :B Q. The correct option for the number of body centred
75% of octahedral voids. The formula of the compound is (B) NaCl is insulator, silicon is semiconductor, silver is unit cells in all 14 types of Bravais lattice unit cells is
conductor,quartzispiezoelectriccrystal.
(A) C4A3 (B) C2A3 (C) C3A2 (D) C3A4
(A) 7 (B) 5 (C) 2 (D) 3
(C) Frenkel defect is favoured in those ionic compounds in
AIIMS 2011
which sizes of cation and anions are almost equal.
NEET 2019
NEET 2017
NEET 2021
ANS : D ANS : D
(D) FeO has non-stoichiometric metal deficiency defect. In 14 types of Bravais lattices, BCC is present in
cubic, tetragonal and orthorhombic crystal systems
ANS : C
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