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Diamond and graphite are ………………..,...

Diamond and graphite are ………………..,

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Allotropes
Allotropes
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Diamond is

Diamond is:

At 5xx10^(4) bar pressure density of diamond and graphite are 3 g//c c and 2g//c c respectively, at certain temperature 'T' .Find the value of DeltaU-DeltaH for the conversion of 1 mole of graphite to 1 mole of diamond at temperature 'T' :

Allotropes of carbon: There are three forms of carbon. i.e., diamond, graphite and fullerene which exxist in crystalline form. Graphite and diamond occur in nature. The structure of diamond is tetrahedral with sp^(3) hybridisation and diamond exist in 3-D netowrk solid. in graphite, carbon is sp^(2) hybridised. each carbon linked to other carbon linked to other carbon atom forms hexagonal ring. it has a layered structure. diamond and graphite are purest form of carbon. Fullerene constitute a new family of carbon allotropes. Consisting of large spheroidal molecule of compound with general formula C_(2n) . common fullerene C_(6),C_(70) , contain 5 and 6 membered rings. Q. Which of the following statement is incorrect for graphite?

Assertion : Diamond and graphite do not have the same crystal structure. Reason : Diamond is crystalline while graphite is amorphous.

For the change, C_("diamond") rarr C_("graphite"), Delta H = -1.89 kJ , if 6 g of diamond and 6 g of graphite are separately burnt to yield CO_2 the heat liberated in first case is:

Explain the difference in properties of diamond and graphite on the basis of their structures.

Discuss the structures of diamond and graphite and explain the hardness and electrical conductivity of these allotropes on the basis of structures.

Give reasons for the following: Diamond & graphite are allotropic modifications of carbon.

Among diamond and graphite, which is a good conductor of electricity ?