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

ans is________

Vishalraj
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Diamond due to its sp3 hybridization .But recently by mohs hardness scale ,by considering compressive pressure ,Wurtzite boron nitride has greater indentation strength than diamond.

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