With the help of the following equations, answer the given questions:
(i) `HCl(aq)+NaOH(aq)toNaCl(aq)+H_(2)O(l)`
(ii) `H_(2)SO_(4)(aq)+2NaOH(aq)toNa_(2)SO_(4)(aq)+2H_(2)O(l)`
(iii) `H_(3)PO_(4)(aq)+3NaOH(aq)toNa_(3)PO_(4)(aq)+3H_(2)O(l)`
Which acid is diprotic, and which one is triprotic?

Explanation

To determine which acids are diprotic and triprotic from the given equations, we can analyze each acid based on the number of hydrogen ions (H⁺) they can donate in aqueous solution.

### Step-by-Step Solution:

1. **Examine the first equation:**
- **Equation:** `HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)`
- **Analysis:** Hydrochloric acid (HCl) donates one hydrogen ion (H⁺) when it dissociates in solution.
- **Conclusion:** HCl is a **monoprotic acid** because it can donate only one H⁺ ion.
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