Which acid is formed when concentrated nitric acid reacts with sulphur?

Sulphuric acid(H2SO4), NO2 and water are formed when concentrated nitric acid reacts with sulphur.

Explanation

Nitric acid (HNO3) is an oxidizing acid and it can oxidize sulfur into its higher oxidation states (+4 or +6). According to the temperature of the concentrated nitric acid solution, sulfur is oxidized to sulfur dioxide (SO2) or sulfuric acid (H2SO4) acid.

Reaction

S + 6HNO3 → H2SO4 + 2H2O + 6NO2

 

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