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Q.

Hardest known material in nature is

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a

Diamond

b

Graphite

c

Granite

d

None

answer is A.

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Detailed Solution

Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, M.P of diamond is 4726.85°C

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