Which among the following is not obtained by treating aqueous silver nitrate with hypophosphorous acid?

Options

A. `H_3PO_3`
B. `Ag`
C. `HNO_3`
D. `H_3PO_4`

Answer

To solve the question, we need to analyze the reaction between aqueous silver nitrate (AgNO3) and hypophosphorous acid (H3PO2).

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this case are aqueous silver nitrate (AgNO3) and hypophosphorous acid (H3PO2).

2. **Write the Chemical Reaction**:
- The reaction can be represented as:
\[ \text{H3PO2} + \text{AgNO3} \rightarrow \text{H3PO4} + \text{Ag} + \text{HNO3} \]

3. **Identify the Products**:
- From the reaction, we can see that the products formed are:
- Phosphoric acid (H3PO4)
- Silver (Ag)
- Nitric acid (HNO3)

4. **Determine Which Compound is Not Obtained**:
- The question asks which of the following is not obtained from the reaction. The options given are:
- H3PO3 (Phosphorous acid)
- Ag (Silver)
- HNO3 (Nitric acid)
- H3PO4 (Phosphoric acid)

5. **Analyze Each Option**:
- H3PO3 (Phosphorous acid) is not produced in the reaction.
- Ag (Silver) is produced.
- HNO3 (Nitric acid) is produced.
- H3PO4 (Phosphoric acid) is produced.

6. **Conclusion**:
- The only compound that is not obtained from the reaction is H3PO3 (Phosphorous acid).

### Final Answer:
The answer is **H3PO3**.