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# 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.**

As X exists in two forms Y and Z, Y and Z are known as the **allotropes of X.** Given that Y is the hardest natural substance, hence, **Y is diamond.**

This implies that **X is carbon,** a non-metal.

Thus, **Z is graphite**, as it is a good conductor of electricity.

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