Which of the following salts undergoes anionic hydrolysis?

Options

A. (a) `CuSO_(4)`
B. (b) `NH_(4)Cl`
C. (c) `FeCl_(3)`
D. (d) `Na_(2)CO_(3)`

Explanation

To determine which of the following salts undergoes anionic hydrolysis, we need to analyze the nature of the acids and bases that form the salts. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Types of Salts
Salts can be formed from combinations of strong acids, weak acids, strong bases, and weak bases. The four types of salts are:
1. Strong acid + Strong base (neutral salt)
2. Strong acid + Weak base (acidic salt)
3. Weak acid + Strong base (basic salt)
4. Weak acid + Weak base (can be either acidic or basic)

### Step 2: Understand Hydrolysis
- **Cationic Hydrolysis** occurs when a salt formed from a strong acid and a weak base is dissolved in water, resulting in an acidic solution.
- **Anionic Hydrolysis** occurs when a salt formed from a weak acid and a strong base is dissolved in water, resulting in a basic solution.

### Step 3: Analyze Each Salt
Now, we will analyze the given salts to see which one undergoes anionic hydrolysis:

1. **CuSO4**:
- Formed from H2SO4 (strong acid) and Cu(OH)2 (weak base).
- Since it is formed from a strong acid, it does not undergo anionic hydrolysis.

2. **NH4Cl**:
- Formed from NH4OH (weak base) and HCl (strong acid).
- This salt will also not undergo anionic hydrolysis as it is formed from a strong acid.

3. **FeCl3**:
- Formed from Fe(OH)3 (weak base) and HCl (strong acid).
- Again, this salt will not undergo anionic hydrolysis as it is derived from a strong acid.

4. **Na2CO3**:
- Formed from NaOH (strong base) and H2CO3 (weak acid).
- Since this salt is formed from a weak acid and a strong base, it will undergo anionic hydrolysis.

### Conclusion
The salt that undergoes anionic hydrolysis is **Na2CO3**.

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