With respect to graphite and diamond, which of the statement(s) given below is (are) correct:

Graphite is harder than diamond

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Graphite has higher electrical conductivity then diamond

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Graphite has higher thermal conductivty then diamond

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Graphite has highter

C - C

bond order then diamond.

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Solution

The correct option is A Graphite is harder than diamond
Graphite is hardest than diamond.Graphite and diamond both are made up of carbon atoms and in case of diamond, each carbon atom forms four covalent bonds in tetrahedral structure but in case of graphite,the carbon atoms forms 3 covalent bonds and forms hexagonal packed structure.

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C - C

Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.

Statement 2: Diamond has five times more thermal conductivity than copper.

Write 'true' or 'false' against the following statements :

(a) Carbon constitutes 0.03 $%$ of the earth's crust.

(b) Graphite is the purest form of carbon.

(d) Graphite has layers of hexagonal carbon bondings.

(e) Diamond is insoluble in all solvents.

{Δ H}_{t r a n s i t i o n}

C (g r a p h i t e) ⟶ C (d i a m o n d)

1.9 k J / m o l

25^{o} C

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