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.


X is Carbon. Carbon allotropes include diamond and graphite. Because diamond is the hardest natural substance, Y is a diamond. Graphite is a good electrical conductor, hence Z is graphite.


  • X is carbon
  • Y is diamond
  • Z is graphite

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