Which of the following has 1.54 Ao bond length throughout the crystal?
sodium chloride
silicon carbide
graphite
diamond
In the Bragg's equation for diffraction of x rays n' represents
The number or moles
Avagadro number
A quantum number
Order of reflection
Which crystal vapourize at 7000oC?
________________ is a good example of covalent crystal .
Diamond
Ice
Graphite
Charcoal
An example of metal deficiency defect is .
NaCl
AgCl
CsCl
FeS
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
Which of the following has its atoms connected by valence bonds?
none of the above
How many carbon atoms surrounded each carbon atom in diamond structure?
8
2
4
6
________________ solids possess properties of incompressibility and rigidity to a certain extent but they do not have definite geometrical forms.
Ionic
Metallic
Amorphous
Molecular
