which of the following salt does not get hydrolysed in water?

Options

A. `KCIO_(4)`
B. `NH_(4)CI`
C. `CH_(3)COONa`
D. None of these

Answer

To determine which salt does not get hydrolyzed in water, we need to understand the concept of hydrolysis and the nature of the ions that make up the salt. Hydrolysis occurs when a salt reacts with water to produce an acidic or basic solution.

### Step-by-Step Solution:

1. **Identify the Components of the Salt**:
- A salt is composed of a cation (positive ion) and an anion (negative ion). For example, in NH4Cl, the cation is NH4+ (ammonium) and the anion is Cl- (chloride).

2. **Determine the Strength of the Acid and Base**:
- Classify the cation and anion based on the strength of the corresponding acid and base from which they are derived.
- NH4+ comes from NH3 (a weak base) and Cl- comes from HCl (a strong acid).

3. **Analyze Hydrolysis**:
- When NH4Cl dissolves in water, NH4+ can react with water to form NH4OH (ammonium hydroxide) and H+. This indicates hydrolysis occurs because NH4+ is from a weak base.
- In contrast, if a salt is formed from a strong acid and a strong base (like NaCl), neither ion will hydrolyze significantly in water.

4. **General Rule**:
- If the cation comes from a strong base and the anion comes from a strong acid, the salt will not undergo hydrolysis.
- For example, KCl is derived from KOH (strong base) and HCl (strong acid), so it does not hydrolyze.

5. **Conclusion**:
- The salt that does not get hydrolyzed in water is one that comes from a strong acid and a strong base. Based on the example given in the video, KCLO4 (potassium perchlorate) is derived from KOH (strong base) and HClO4 (strong acid), thus it does not undergo hydrolysis.

### Final Answer:
The salt that does not get hydrolyzed in water is **KClO4**.