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A non-metal X exists in two different fo...

A non-metal X exists in two different forms Y and Z. Y is hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

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Since ''Y'' is the hardest occuring non-metal, it is diamond. The non-metal ''X'' is carbon. Y is the crystalline allotropic form of carbon. The other allotropic form Z which is a good conductor of electricity is graphite.
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