A non-metal X-exists in two different forms Y and Z.

Question:

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

Solution:

Since “Y” is the hardest occuring non-metal, it is diamond. The non-metal “X” is carbon. Y is the crystalline allotropie form of carbon. The other

allotropie form Z which is a good conductor of electricity is graphite.

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