Diamond is a _______ crystal.
opaque
transparent
translucent
none of the above
In ______________ crystals, the units occupying lattice are positive and negative ions.
Metallic
Covalent
Ionic
Molecular
The defect which is caused if some of the lattice points are unoccupied are called
Point defect
Lattice vacancies
Schottky defect
Frenkel defect
The conductivity due to the positive holes are called
Superconductors
n-type semiconductor
p - type semiconductors
Conductors
If the deviation occurs due to missing atoms, displaced atoms or extra atoms, the imperfection is named as
Schottry defect
Metal excess defect
How many carbon atoms surrounded each carbon atom in diamond structure?
8
2
4
6
Which unit cell have diamond cell?
triclinic
trigonal
octahedral
tetrahedral
Which bond connects the carbon atom in a diamond crystal?
valence bond
covalent bond
coordinate bond
ionic bond
Which crystal does not have free electrons for electric conduction?
ionic crystal
covalent network crystal
both (a) and (b)
Which of the following has 1.54 Ao bond length throughout the crystal?
sodium chloride
silicon carbide
graphite
diamond
