Which of the following cannot be hydrolysed?

Options

A. A salt of weak acid and strong base
B. A salt of strong acid and weak base
C. A salt of weak acid and weakk base
D. A salt of strong acid and strong base

Answer

To determine which of the following cannot be hydrolyzed, we need to analyze the salts based on their acid-base properties. Hydrolysis refers to the reaction of a salt with water, leading to the formation of an acid or a base.

### Step-by-Step Solution:

1. **Identify the Types of Salts**:
- **Salt of Weak Acid and Strong Base**: Example: CH3COONa (Sodium acetate)
- **Salt of Strong Acid and Weak Base**: Example: NH4Cl (Ammonium chloride)
- **Salt of Strong Acid and Strong Base**: Example: NaCl (Sodium chloride)
- **Salt of Weak Acid and Weak Base**: Example: CH3COONH4 (Ammonium acetate)

2. **Analyze Hydrolysis**:
- **Salt of Weak Acid and Strong Base**:
- Hydrolyzes to produce a weak acid (CH3COOH) and OH⁻ ions.
- **Salt of Strong Acid and Weak Base**:
- Hydrolyzes to produce a weak base (NH4OH) and H⁺ ions.
- **Salt of Strong Acid and Strong Base**:
- Does not hydrolyze because it does not produce any acidic or basic ions. Example: NaCl remains as Na⁺ and Cl⁻ in solution without affecting the pH.
- **Salt of Weak Acid and Weak Base**:
- Hydrolyzes to produce both a weak acid and a weak base.

3. **Conclusion**:
- The salt that cannot be hydrolyzed is the **Salt of Strong Acid and Strong Base**, which in our example is NaCl (Sodium chloride). This salt does not alter the pH of the solution and remains neutral.

### Final Answer:
The salt that cannot be hydrolyzed is **NaCl (Sodium chloride)**.

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