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

A $H_2SO_4$, sulphuric acid

B $H_2S_2O_8$, peroxodisulphuric acid

C $H_2S_2O_7$, pyrosulphuric acid

D $H_2SO_3$, sulphurous acid

The answer is B.

Solution

Peroxodisulphuric acid ($H_2S_2O_8$) contains the peroxo –O–O– linkage:
$HO-SO_2-O-O-SO_2-OH$

Concept peroxo linkage in peroxodisulphuric acid

2 questions from this chapter have appeared across 2 exam years.