Which of the following are soft crystal?
ionic crystals
covalent molecular crystals
covalent network crystals
metallic crystals
Which energy is acquired by the mobile electrons in heated portion of the metal?
Kinetic energy
Tidal energy
Electric energy
Thermal energy
The unit cell has cations (P+) at each corners and anions(Q-) at the center of the cube. The simplest formula of the compound is
AB
AB2
A2B
A2B3
Graphite is a covalent network crystal but what is its exceptional property?
high melting point
low volatile
bad conduction
good conduction
Graphite is less dense than
silicon carlide
sodium chloride
diamond
none of these
What is the C-C bond length in diamond?
1.31 Ao
2.6 Ao
1.54 Ao
0.86 Ao
__________ are hard and brittle.
Ionic crystals
Covalent molecular crystals
Covalent crystals
Metallic crystals
Which of the following has low melting points?
covalent crystals
molecular crystals
Covalent molecular crystals have low
melting point
boiling point
freezing point
vapourizing point
