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. [CBSE 2011, HOTS]

Answer 1

Answer:

Y, that is, the hardest naturally occurring substance in the world is diamond. The substance Z, which is a good conductor of electricity is Graphite. Both diamond and Graphite come from Carbon, a non-metal which lacks lustre, and also does not conduct electricity.

Explanation:

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Answer 2

Answer:

x is carbon y is diamond and z is graphite

Explanation:

this two or more form of a element is known as allotrophy