Aqueous solution of which salt will not be hydrolysed?

Options

A. Potassium nitrate
B. Potassium cyanide
C. Potassium formate
D. Potassium acetate

Answer

To determine which aqueous salt will not be hydrolyzed, we need to understand the concept of hydrolysis in salts. Hydrolysis occurs when a salt reacts with water to produce an acidic or basic solution.

### Step-by-Step Solution:

1. **Identify the Types of Salts**:
- Salts can be formed from strong acids and strong bases, strong acids and weak bases, weak acids and strong bases, or weak acids and weak bases.
- Salts formed from strong acids and strong bases do not undergo hydrolysis.

2. **Examples of Salts**:
- **Potassium Nitrate (KNO3)**: This salt is formed from potassium hydroxide (KOH), a strong base, and nitric acid (HNO3), a strong acid. Since both the acid and base are strong, KNO3 will not hydrolyze.
- **Potassium Cyanide (KCN)**: This salt is formed from KOH (strong base) and hydrocyanic acid (HCN, a weak acid). KCN will undergo hydrolysis due to the weak acid.
- **Potassium Formate (KHCOO)**: This salt is formed from KOH (strong base) and formic acid (HCOOH, a weak acid). KHCOO will also undergo hydrolysis.
- **Potassium Acetate (CH3COOK)**: This salt is formed from KOH (strong base) and acetic acid (CH3COOH, a weak acid). CH3COOK will also undergo hydrolysis.

3. **Conclusion**:
- Among the salts listed, only potassium nitrate (KNO3) is formed from a strong acid and a strong base, hence it will not be hydrolyzed in an aqueous solution.

### Final Answer:
The aqueous solution of potassium nitrate (KNO3) will not be hydrolyzed.

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