In the estimation of sulphur organic compound on treating with conc. `HNO_(3)` is converted to

Options

A. `SO_(2)`
B. `H_(2)S`
C. `H_(2)SO_(4)`
D. `SO_(3)`

Answer

To solve the question regarding the conversion of sulfur in an organic compound when treated with concentrated nitric acid, we can follow these steps:

### Step 1: Understanding the Reaction
The estimation of sulfur in organic compounds is typically performed using the Caries method. This method involves the oxidation of sulfur to form a specific product.

**Hint:** Remember that the Caries method is a common technique used for sulfur estimation.

### Step 2: Identifying the Reactants
In the Caries method, sulfur reacts with water (H₂O) and oxygen (O₂) in the presence of concentrated nitric acid (HNO₃).

**Hint:** Focus on the reactants involved in the Caries method.

### Step 3: Writing the Reaction
The reaction can be represented as follows:
\[ \text{S} + \text{H}_2\text{O} + \frac{3}{2} \text{O}_2 \xrightarrow{\text{conc. } \text{HNO}_3} \text{H}_2\text{SO}_4 \]

This indicates that sulfur (S) is oxidized to form sulfuric acid (H₂SO₄).

**Hint:** Pay attention to the stoichiometry of the reaction and the products formed.

### Step 4: Identifying the Product
From the reaction, we can see that sulfur is converted into sulfuric acid (H₂SO₄) when treated with concentrated nitric acid.

**Hint:** The final product of the reaction is crucial for answering the question.

### Step 5: Conclusion
Thus, the answer to the question is that sulfur in an organic compound, when treated with concentrated nitric acid, is converted to sulfuric acid (H₂SO₄).

**Final Answer:** Sulfur is converted to sulfuric acid (H₂SO₄).