What happened when Graphite treated concentrated acids like HNO3/HF or KMnO4 ?.

Dimomd is unaffected by concentrated acids but Graphite when heated with oxidizing agents like alkaline KMnO4 , HNO3 forms mellatic acid (Benzene hexa carboxylic acid).

Graphite on oxidation with hot HNO₃ gives acid i.e. known as Graphite acid or Graphite oxide