Hardest substance known is___________??? 1. Diamond 2. graphite 3. alloy of tin and iron 4. enamel of tooth

ans is________

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• dimond

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• diamond

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• diamond

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• Diamond

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• diamond

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• Diamond

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• enamel of tooth

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• diamond

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• diamond

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• Diamond

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• diamond

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• 4

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• diamond

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• diamond

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