Peroxodisulphate, obtained by electrolytic oxidation of acidified sulphate solutions at high current density, on hydrolysis yields hydrogen peroxide.
2HSO4−(aq)⟶ElectrolysisHO3SOOSO3H(aq)→Hydrolysis2HSO4−(aq)+2H+(aq)+H2O2(aq)
Hydrogen peroxide has a non-planar structure. The molecular dimensions in the gas phase and solid phase are shown

H2O2 structure in gas phase, dihedral angle is 111.5∘.
H2O2 structure in solid phase at 110K, dihedral angle is 90.2∘.