If the deviation occurs due to missing atoms, displaced atoms or extra atoms, the imperfection is named as
Schottry defect
Point defect
Frenkel defect
Metal excess defect
Carbon atoms in a diamond crystal are in a state of
sp3 hybridization
sp2 hybridization
sp hybridization
sp2d hybridization
________________ is the property of a material by which it allows the flow if electric current.
Resistivity
Conductivity
Superconductivity
Sublimation
Which of the following is extremely hard?
coal
silicon carbide
coke
plastic
An example of metal deficiency defect is .
NaCl
AgCl
CsCl
FeS
At what temperature diamond can be vapourized?
1000o C
4000oC
7000oC
400oC
Graphite is a covalent network crystal but what is its exceptional property?
High melting point
low volatile
bad conduction
good conduction
Which crystal is not made up of ions?
covalent network crystals
ion crystal
both a and b
none of these
________________ solids possess properties of incompressibility and rigidity to a certain extent but they do not have definite geometrical forms.
Ionic
Metallic
Amorphous
Molecular
_______________ is the smallest fundamental repeating portion of a crystal lattice from which the crystal is built by repetition in three dimension.
Unit cell
Void
Ionic crystal
Covalent crystal
