What is the difference between the nature of pi-bonds present in `H_3PO_3` and `HNO_3` molecules?

Explanation

To understand the difference between the nature of pi-bonds present in \( H_3PO_3 \) (phosphorous acid) and \( HNO_3 \) (nitric acid), we need to analyze the structures of both molecules and the bonding involved.

### Step-by-Step Solution:

1. **Identify the Central Atoms**:
- In \( H_3PO_3 \), the central atom is phosphorus (P).
- In \( HNO_3 \), the central atom is nitrogen (N).

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