Question
The known per-oxoacids of Sulphur are :
A. $\text{H}_{2}\text{SO}_{5}$
B. $\text{H}_{2}\text{S}_{2}\text{O}_{9}$
C. $\text{H}_{3}\text{S}_{4}\text{O}_{12}$
D. $\text{H}_{2}\text{S}_{2}\text{O}_{8}$
E. $\text{H}_{2}\text{S}_{2}\text{O}_{7}$
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, D only
Sulphur Per-Oxoacids Identification
Per-oxoacids of sulfur are compounds containing at least one peroxide group ($ \text{-O-O-} $) within their structure, bridging sulfur atoms or linking sulfur to oxygen.
Analyzing Sulphur Compound Formulas
We examine each given formula to determine if it represents a known per-oxoacid of sulfur:
- A. $\text{H}_{2}\text{SO}_{5}$: This is peroxymonosulfuric acid, commonly known as Caro's acid. It possesses the structure $ \text{HO-SO}_2 \text{-O-OH} $, featuring the characteristic $ \text{-O-O-} $ peroxide linkage. It is a known per-oxoacid.
- B. $\text{H}_{2}\text{S}_{2}\text{O}_{9}$: This formula does not correspond to any commonly recognized or stable per-oxoacid of sulfur.
- C. $\text{H}_{3}\text{S}_{4}\text{O}_{12}$: This complex formula does not represent a standard per-oxoacid of sulfur.
- D. $\text{H}_{2}\text{S}_{2}\text{O}_{8}$: This is peroxydisulfuric acid. Its structure is $ \text{HO-SO}_2 \text{-O-O-} \text{SO}_2 \text{-OH} $, clearly indicating the presence of the $ \text{-O-O-} $ peroxide group. It is a known per-oxoacid.
- E. $\text{H}_{2}\text{S}_{2}\text{O}_{7}$: This compound is disulfuric acid (also known as pyrosulfuric acid). Its structure involves an $ \text{S-O-S} $ linkage ($ \text{HO-SO}_2 \text{-O-} \text{SO}_2 \text{-OH} $), but it lacks the essential $ \text{-O-O-} $ peroxide bond. Therefore, it is not classified as a per-oxoacid.
Conclusion on Per-Oxoacids
Based on the structural analysis, the known per-oxoacids of sulfur among the given options are $\text{H}_{2}\text{SO}_{5}$ (Option A) and $\text{H}_{2}\text{S}_{2}\text{O}_{8}$ (Option D).
The correct choice is the one that includes only A and D.
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