The total number of diprotic acids among the following is
`H_(3)PO_(4), H_(2)SO_(4), H_(3)PO_(3), H_(2)CO_(3), H_(2)S_(2)O_(7), H_(3)BO_(3), H_(3)PO_(2), H_(2)CrO_(4), H_(2)SO_(3)`

Explanation

To determine the total number of diprotic acids among the given compounds, we need to analyze each acid based on its chemical structure and the number of ionizable hydrogen ions (H⁺) it can donate. A diprotic acid is defined as an acid that can donate two protons (H⁺ ions).

Let's analyze each compound:

1. **H₃PO₄ (Phosphoric acid)**:
- Structure: H₃PO₄ has three ionizable hydrogen ions.
- Classification: Triprotic (not diprotic).

2. **H₂SO₄ (Sulfuric acid)**:
- Structure: H₂SO₄ has two ionizable hydrogen ions.
- Classification: Diprotic.

3. **H₃PO₃ (Phosphorous acid)**:
- Structure: H₃PO₃ has two ionizable hydrogen ions.
- Classification: Diprotic.

4. **H₂CO₃ (Carbonic acid)**:
- Structure: H₂CO₃ has two ionizable hydrogen ions.
- Classification: Diprotic.

5. **H₂S₂O₇ (Disulfuric acid or Oleum)**:
- Structure: H₂S₂O₇ has two ionizable hydrogen ions.
- Classification: Diprotic.

6. **H₃BO₃ (Boric acid)**:
- Structure: H₃BO₃ has one ionizable hydrogen ion.
- Classification: Monoprotic (not diprotic).

7. **H₃PO₂ (Hypophosphorous acid)**:
- Structure: H₃PO₂ has one ionizable hydrogen ion.
- Classification: Monoprotic (not diprotic).

8. **H₂CrO₄ (Chromic acid)**:
- Structure: H₂CrO₄ has two ionizable hydrogen ions.
- Classification: Diprotic.

9. **H₂SO₃ (Sulfurous acid)**:
- Structure: H₂SO₃ has two ionizable hydrogen ions.
- Classification: Diprotic.

Now, let's summarize the classification of each acid based on the analysis:

- **Diprotic Acids**: H₂SO₄, H₃PO₃, H₂CO₃, H₂S₂O₇, H₂CrO₄, H₂SO₃
- **Not Diprotic**: H₃PO₄ (Triprotic), H₃BO₃ (Monoprotic), H₃PO₂ (Monoprotic)

Counting the diprotic acids, we find:

- H₂SO₄
- H₃PO₃
- H₂CO₃
- H₂S₂O₇
- H₂CrO₄
- H₂SO₃

Total diprotic acids = 6

**Final Answer**: The total number of diprotic acids is **6**.

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