Find the number of dibasic oxyacids in the following:
`H_(2)CO_(3),H_(2)SO_(3),H_(3)PO_(2),H_(3)PO_(3),H_(3)BO_(3)`
Dibasic oxo-acids are `H_(2)CO_(3),H_(2)SO_(3) and H_(3)PO_(3)`.

Explanation

To determine the number of dibasic oxyacids from the given list, we need to analyze each compound based on the number of hydroxyl (–OH) groups it contains. A dibasic acid is defined as an acid that can donate two protons (H⁺ ions), which typically corresponds to having two hydroxyl groups.

Let's analyze each compound step by step:

### Step 1: Analyze H₂CO₃ (Carbonic Acid)
- **Structure**: H₂CO₃ has the following structure:
- C(=O)
- OH
- OH
- **Hydroxyl Groups**: There are 2 hydroxyl groups (–OH).
- **Basicity**: Therefore, H₂CO₃ is dibasic.

### Step 2: Analyze H₂SO₃ (Sulfurous Acid)
- **Structure**: H₂SO₃ has the following structure:
- S(=O)
- OH
- OH
- **Hydroxyl Groups**: There are 2 hydroxyl groups (–OH).
- **Basicity**: Therefore, H₂SO₃ is dibasic.

### Step 3: Analyze H₃PO₂ (Phosphorous Acid)
- **Structure**: H₃PO₂ has the following structure:
- P(=O)
- OH
- H
- **Hydroxyl Groups**: There is only 1 hydroxyl group (–OH).
- **Basicity**: Therefore, H₃PO₂ is monobasic.

### Step 4: Analyze H₃PO₃ (Phosphoric Acid)
- **Structure**: H₃PO₃ has the following structure:
- P(=O)
- OH
- OH
- H
- **Hydroxyl Groups**: There are 2 hydroxyl groups (–OH).
- **Basicity**: Therefore, H₃PO₃ is dibasic.

### Step 5: Analyze H₃BO₃ (Boric Acid)
- **Structure**: H₃BO₃ has the following structure:
- B(=O)
- OH
- OH
- OH
- **Hydroxyl Groups**: There are 3 hydroxyl groups (–OH).
- **Basicity**: Therefore, H₃BO₃ is tribasic.

### Conclusion
From the analysis:
- Dibasic oxyacids identified: H₂CO₃, H₂SO₃, and H₃PO₃.
- Total number of dibasic oxyacids = 3.

### Final Answer
The number of dibasic oxyacids in the given list is **3**.

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