Crystals having irregular external shapes but regular internal structures are known as
Crystallites
Primitives
Poly crystals
Unit cell
Which of the following is a non polar molecule?
NH3
H2O
CO2
H2
Which system does the metallic crystal have?
Face Centred cubic system
Body centred cubic system
Simple cubic system
Side centred cubic system
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 are held together by both dispersion forces and dipole- dipole forces?
Semi polar molecules
Polar molecules
Quarter polar molecules
Non polar molecules
