InterviewSolution
It is insoluble in all solventsIt is oxidised with a mixture of `k_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)` at `200^(@)C`.Being hardest, it is used an abrasive for SHARPENING hard TOOLS`Delta_(f)H^(@)` value of diamond is `1.90 KJ mol^(-1)`.
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