Which of the following is true for diamond?

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(D) Diamond is a covalent network solid where each carbon atom is $sp^3$ hybridized and bonded to four other carbon atoms in a tetrahedral geometry.It

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Diamond is an allotrope of carbon

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(D) Diamond is a covalent network solid where each carbon atom is $sp^3$ hybridized and bonded to four other carbon atoms in a tetrahedral geometry.It is the hardest known natural material.It is a poor conductor of electricity because there are no free electrons.However,it is an excellent conductor of heat due to the strong covalent bonding network.Therefore,the statement that diamond is a bad conductor of heat is false,and the only correct description among typical properties is that it is an allotrope of carbon.

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