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Q.

_______ an allotrope of carbon is the hardest natural substance known and has a very high melting and boiling point.

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a

Silver

b

Coal

c

Carbohydrates

d

Diamond

answer is B.

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Detailed Solution

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Diamond, an allotrope of carbon, is the hardest natural substance known and has a very high melting and boiling point. In the structure of a diamond, carbon atoms are arranged in a crystal form.

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