Prove that Sulfuric acid is a strong Oxidizing agent

Sulfuric acid is a strong oxidizing agent—Proof:

When hydrobromic acid is heated in a test tube with concentrated H2SO4, red bromine gas is released. By this, H2SO4 oxidizes hydrobromic acid to liberate bromine.

2HBr + H2SO4 = Br2 + SO2 + 2H2O