Name two crystalline and four amorphous allotropes of carbon

Following is an amorphous allotrope of carbon.

Name the following: An amorphous allotrope of carbon which floats on water.

Which is hardest allotrope of carbon.

Name the allotropes of oxygen.

Name three crystalline allotropes of carbon.

Name the following: A crystalline allotrope of carbon built up from a hexagonal unit.

With reference to the structure of the two crystalline allotropes of carbon, state why diamond is inert or unreactive while graphite in comparably more reactive,

Compare the structure of the crystal of diamond graphite with special reference to the reason for diamond being the hardest natural substance while graphite one of the softest. Compare the electrical & thermal conductivity of the two crystalline allotropes of carbon.

Define allotropy. Name the various allotropes of carbon.

Mention three differences between crystalline and amorphous solids.