If X is a non-metal, it will conduct electricity unless it is carbon in the form of

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Graphite

Diamond

Fullerene

None of these

answer is A.

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Detailed Solution

concept - Carbon exists in more than one form and these forms are graphite, diamond, and fullerene. Carbon is able to show allotropes due to its property of catenation and pΠ-pΠ bond formation.
Graphite has a layered structure in which carbons are arranged in hexagonal rings. These layers are held together by weaker forces.
Each carbon atom has one non-bonded electron which is delocalized between the layers of Graphite. Due to the delocalization of these pi-electron clouds present all over the substance graphite is a very good conductor of electricity.
Hence, graphite will conduct electricity.
Thus, the correct option is (1).

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