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WorksheetsCLASS XII CHEMISTRY (SOLID STATES)
Total questions: 20
Worksheet time: 15mins
The number of nearest particles which is in direct contact with a particle in a closed packed structure
Unit Cell
Void
Packing efficiency
Coordination number
Crystal system characterized by a ≠ b≠ c and α = β = γ = 90o
Hexagonal
Ortho rhombic
Tetragonal
Triclinic
In a primitive unit cell atoms are present at the
Corners & Centers of any 2 opposite sides
Corners only
Corners and Body Centre
Corners & Centers of all faces
There are ……….. Bravais lattices corresponding to 7 different Crystal Systems
8
9
14
13
The wrong statement about Para magnetism
They are weakly attracted by a magnetic field
They are magnetized in a magnetic field in the same direction
They keep their magnetism in the absence of magnetic field
It is due to the presence of one or more unpaired electrons
Crystal showing both Schottky & Frenkel defect
AgBr
ZnO
AgI
NaCl
Defect shown by ionic crystals with large difference in size
Schottky Defect
Impurity Defect
Frenkel Defect
Metal Deficiency Defect
Anionic sites occupied by unpaired electrons are called
F Centres
Interstitial Centres
Cationic Centres
Anionic Centres
An amorphous solid
CaCl2
NaCl
Glass
CsCl
Defect causing decrease in density
Schottky
Frenkel
F- centre
Metal Excess
Density of a crystal is given by the formula
ZNAa3M
Za3NAM
a3NAZM
ZMa3NA
AB AB … type close packing pattern represents
HCP
FCC
CCP
BCC
What type of material is this one?
Crystal
Amorphous
Covalent Crystal
Ionic Crystal
Is the most common crystal system for metals
Tetragonal
Trigonal
Monoclinic
Cubic
How many complete atoms can we find on the BCC (body centered cubic) structure?
1
2
3
4
Obtain the volume of the BCC crystal structure in term of it the atomic radius.
2R3
16R3√2
(4R/√3)3
(4R)3
Molybdenum (Mo) has a BCC crystal structure, an atomic radius of 0.1363 nm. Compute its theoretical volume.
3.1187x10-23 cm3
1.5594x10-23 cm3
3.1187x10-23 m3
1.5594x10-23 m3
Molybdenum (Mo) has a BCC crystal structure, an atomic radius of 0.1363 nm, and an atomic
weight of 95.94 g/mol. Compute its theoretical density.
5.1083 g/cm3
10.2165 g/cm3
20.4331 g/cm3
10.2165 kg/m3
What is the coordination number in the FCC structure?
24
12
8
4
Which of the following statements about crystals is incorrect?
The shape of a crystal is dependent on the chemical conditions under which it formed
There are seven large groups of crystal geometries or crystal systems.
There are many geometric planes in a single crystal.
The atomic structure of a crystal defines it's geometric shape.
The shape of a crystal is independent of the physical conditions under which it formed.
