(a) What is diamond ? Of what substance is diamond made?
(b) Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond.
(c) Explain why, diamond has a high melting point
(d) State any two uses of diamond.

Carbon atoms in diamond show

In the structure of diamond, carbon atoms appear at

Carbon atom in diamond are arranged in

Oxidation states of carbon atoms in diamond and graphite are.

(a) What is graphite? Of what substance is graphite made? (b) Describe the structure of graphite with the help of a labelled diagram. (c ) Why is graphite a good conductor of electricity but diamond is a non conductor of electricity? (d) State any two uses of graphite.

Diamond is covalent, yet it has high melting point. Why ?

A : Number of carbon atoms per unit cell in diamond is 8. R : The structure of diamond is similar to ZnS.

(a) Write t wo points of difference in the structures of diamond and graphite (b) Explain why graphite can be used as a lubricant but diamond cannot. (c ) Explain why , diamond can be used in rock drilling equipment but graphite cannot. (d) Stae one use of diamond which depends on its 'extraordinary brilliance ' and one use of graphite which depends on its being black and quite soft.