The non-metal which is hard is :

sulphur

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chlorine

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graphite

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diamond

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Solution

The correct option is D diamond
Carbon is a non-metal that can exist in different forms. These forms only differ in structure and each form is called an allotrope. Diamond, an allotrope of carbon, is the hardest natural substance known and has very high melting and boiling point.
So, the answer is $D$ .

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