Question

Which of the following oxoacid of sulphur has -O-O- linkage?

Options

• H₂SO₃, sulphurous acid

• H₂SO₄, sulphuric acid

• H₂S₂O₈, peroxodisulphuric acid

• H₂S₂O₇, pyrosulphuric acid

Answer 1

H₂S₂O₈, peroxodisulphuric acid

Explanation:

Peroxodisulphuric acid (H₂S₂O₈) contains an -O-O- (peroxo) linkage between the two sulphur atoms. This bond is characteristic of peroxo compounds, unlike sulphurous acid (H₂SO₃), sulphuric acid (H₂SO₄), and pyrosulphuric acid (H₂S₂O₇), which do not have this peroxide (-O-O-) linkage in their structure.