Graphite is a covalent network crystal but what is its exceptional property?
High melting point
Low volatile
Bad conduction
Good conduction
Which crystal does not have free electrons for electric conduction?
ionic crystal
covalent network crystal
both (a) and (b)
none of these
Which of the following has 1.54 Ao bond length throughout the crystal?
sodium chloride
silicon carbide
graphite
Which is the crystal that vapourizes at 7000oC?
diamond
