Con. Sulphuric acid react with Sulphur

HOT concentrated sulphuric acid reacts with sulphur to give out sulphur dioxide and water. It is because concentrated sulphuric acid is a strong oxidizing agent, which can oxidize non-metals to their oxides.

Chemical equation:
S (s) + 2H2SO4 (l) → 3SO2 (g) + 2H2O (l)

Observations:
1. Some colourless gas with characteristic pungent smell is evolved.
2. Sulphur dissolves in the solution.



Similarly, HOT concentrated nitric acid will oxidize carbon as it is a strong oxidizing agent. Carbon dioxide, nitrogen dioxide and water is produced.

Chemical equation:
C (s) + 4HNO3 (l) → CO2 (g) + 4NO2 (g) + 2H2O (l)

Observations:
1. Some reddish brown fumes with pungent smell is evolved.
2. Carbon dissolves in the solution.