Hydrolysis of one mole of peroxy disulphuric acid produces

Options

A. two moles of sulphuric acid
B. two moles of peroxymonosulphuric acid.
C. one mole of sulphuric acid and one mole of peroxy monosulphuric acid
D. one mole of sulphuric acid, one mole of hydrogen peroxide.

Answer

To solve the question regarding the hydrolysis of one mole of peroxydisulfuric acid (H2S2O8), we will follow these steps:

### Step 1: Understand the Structure of Peroxydisulfuric Acid
Peroxydisulfuric acid, also known as Marshall's acid, has the chemical formula H2S2O8. Its structure can be represented as follows:
- Each sulfur atom is bonded to oxygen atoms, with one of the oxygen atoms forming a peroxide linkage (O-O).

### Step 2: Determine the Hydrolysis Process
Hydrolysis involves the reaction of a compound with water. In the case of peroxydisulfuric acid, it can undergo either complete or partial hydrolysis:
- **Complete Hydrolysis**: This would involve breaking both the S-O bonds and adding water to form sulfuric acid and hydrogen peroxide.
- **Partial Hydrolysis**: This would involve breaking only one of the S-O bonds and adding water to form sulfuric acid and peroxy monosulfuric acid.

### Step 3: Calculate the Products of Complete Hydrolysis
If peroxydisulfuric acid undergoes complete hydrolysis with 2 moles of water, the products would be:
- 2 moles of sulfuric acid (H2SO4)
- 1 mole of hydrogen peroxide (H2O2)

### Step 4: Calculate the Products of Partial Hydrolysis
If peroxydisulfuric acid undergoes partial hydrolysis with 1 mole of water, the products would be:
- 1 mole of sulfuric acid (H2SO4)
- 1 mole of peroxy monosulfuric acid (H2SO5)

### Step 5: Analyze the Given Options
Now, we need to evaluate the options based on the products obtained from both complete and partial hydrolysis:
1. 2 moles of sulfuric acid - Incorrect (only occurs in complete hydrolysis).
2. 2 moles of peroxy monosulfuric acid - Incorrect (not a product of hydrolysis).
3. 1 mole of sulfuric acid and 1 mole of peroxy monosulfuric acid - Correct (this is from partial hydrolysis).
4. 1 mole of sulfuric acid and 1 mole of hydrogen peroxide - Incorrect (this does not match the products).

### Conclusion
The correct answer is **1 mole of sulfuric acid and 1 mole of peroxy monosulfuric acid**, which corresponds to option 3.

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