How many acids below are polyprotic? HNO3 H2SO4 H2CO3 HCN H2C204 0 1 O 2 O 4 O 5

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### Question: How many acids below are polyprotic?

#### Options:
- HNO₃
- H₂SO₄
- H₂CO₃
- HCN
- H₂C₂O₄

1. ☐
2. ☐
3. ☑
4. ☐
5. ☐

### Explanation:

The question asks to identify how many of the listed acids are polyprotic.

**Polyprotic acids** are acids that can donate more than one proton (H⁺ ion) per molecule in acid-base reactions. Let's review each acid in the list:

- **HNO₃ (Nitric Acid)**: Monoprotic, donates one proton.
- **H₂SO₄ (Sulfuric Acid)**: Diprotic, donates two protons.
- **H₂CO₃ (Carbonic Acid)**: Diprotic, donates two protons.
- **HCN (Hydrocyanic Acid)**: Monoprotic, donates one proton.
- **H₂C₂O₄ (Oxalic Acid)**: Diprotic, donates two protons.

From this, the polyprotic acids are H₂SO₄, H₂CO₃, and H₂C₂O₄. Hence, there are 3 polyprotic acids. The correct answer marked is 3.
Transcribed Image Text:### Question: How many acids below are polyprotic? #### Options: - HNO₃ - H₂SO₄ - H₂CO₃ - HCN - H₂C₂O₄ 1. ☐ 2. ☐ 3. ☑ 4. ☐ 5. ☐ ### Explanation: The question asks to identify how many of the listed acids are polyprotic. **Polyprotic acids** are acids that can donate more than one proton (H⁺ ion) per molecule in acid-base reactions. Let's review each acid in the list: - **HNO₃ (Nitric Acid)**: Monoprotic, donates one proton. - **H₂SO₄ (Sulfuric Acid)**: Diprotic, donates two protons. - **H₂CO₃ (Carbonic Acid)**: Diprotic, donates two protons. - **HCN (Hydrocyanic Acid)**: Monoprotic, donates one proton. - **H₂C₂O₄ (Oxalic Acid)**: Diprotic, donates two protons. From this, the polyprotic acids are H₂SO₄, H₂CO₃, and H₂C₂O₄. Hence, there are 3 polyprotic acids. The correct answer marked is 3.
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