Which crystal does not have free electrons for electric conduction?
ionic crystal
covalent network crystal
both (a) and (b)
none of these
The semi conductors which exhibit conductivity due to the flow of excess negative electrons are called
p -type semiconductos
n - type semiconductors
Scoper conductors
Semiconductors
At what temperature diamond can be vapourized?
1000o C
4000oC
7000oC
400oC
Which crystal is not made up of ions?
covalent network crystals
ion crystal
both a and b
________________ is the property of a material by which it allows the flow if electric current.
Resistivity
Conductivity
Superconductivity
Sublimation
Carbon atoms in a diamond crystal are in a state of
sp3 hybridization
sp2 hybridization
sp hybridization
sp2d hybridization
Which covalent network crystal is an exception in electrical conductivity?
silicon carbide
diamond
graphite
What is the C-C bond length in diamond?
1.31 Ao
2.6 Ao
1.54 Ao
0.86 Ao
Which of the following allows light to pass through it?
coal
lead
________________ is a good example of covalent crystal .
Diamond
Ice
Graphite
Charcoal
