Question:medium
Which of the following oxoacid of sulphur has -O-O- linkage?
Which of the following oxoacid of sulphur has -O-O- linkage?
Updated On: May 7, 2026
- $H_2SO_3$, sulphurous acid
- $H_2SO_4$ sulphuric acid
- $H_2S_2O_8$, peroxodisulphuric acid
- $H_2S_2O_7$, pyrosulphuric acid
Show Solution
The Correct Option is C
Solution and Explanation
To determine which oxoacid of sulfur has an \(-O-O-\) (peroxy) linkage, we need to examine the structures of the given compounds:
- \(H_2SO_3\) (sulphurous acid): This acid does not contain peroxy linkage. Its structure comprises sulfur with a single bond to two hydroxyl groups and one double bond to an oxygen, forming sulfurous acid.
- \(H_2SO_4\) (sulphuric acid): Sulphuric acid lacks the peroxy linkage. It consists of sulfur centrally double-bonded to two oxygens and single-bonded to two hydroxyl groups.
- \(H_2S_2O_8\) (peroxodisulphuric acid): This is the acid in question that contains the \(-O-O-\) linkage. It is characterized by two sulfur atoms, each connected by an oxygen, and additionally connected by a peroxy link. This is characteristic of peroxodisulfuric acid, also known as Marshall's acid.
- \(H_2S_2O_7\) (pyrosulphuric acid): Pyrosulphuric acid doesn't have the peroxy linkage. It features two sulfur atoms each bonded to oxygens and a bridging oxygen between the two sulfur atoms, characteristic of pyrosulfuric or oleum.
Based on the structures, the correct answer is \(H_2S_2O_8\), peroxodisulphuric acid, which clearly contains the \(-O-O-\) linkage.
This identification uses our knowledge of chemical structures and specifically identifies the presence of peroxy bonds, which are unique to peroxodisulphuric acid among the provided options.
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