Which of the following salts will give basic solution on hydrolysis ?

Options

A. `NH_(4)Cl`
B. `KCl`
C. `K_(2)CO_(3)`
D. `(NH_(4))_(2)CO_(3)`

Explanation

To determine which of the following salts will give a basic solution upon hydrolysis, we need to analyze the nature of the acids and bases from which the salts are derived.

### Step-by-Step Solution:

1. **Identify the Types of Salts**:
Salts can be classified based on the strength of the acids and bases from which they are formed:
- **Neutral Salts**: Formed from strong acids and strong bases (e.g., NaCl).
- **Acidic Salts**: Formed from strong acids and weak bases (e.g., NH4Cl).
- **Basic Salts**: Formed from weak acids and strong bases (e.g., Na2CO3).
- **Neutral Salts**: Formed from weak acids and weak bases (e.g., CH3COONa).

2. **Analyze Each Option**:
- **Option 1: NH4OH + HCl**: This salt is formed from a weak base (NH4OH) and a strong acid (HCl). Therefore, it is acidic in nature.
- **Option 2: KOH + HCl**: This salt is formed from a strong base (KOH) and a strong acid (HCl). Therefore, it is neutral in nature.
- **Option 3: KOH + H2CO3**: This salt is formed from a strong base (KOH) and a weak acid (H2CO3). Therefore, it is basic in nature.
- **Option 4: NH4OH + H2CO3**: This salt is formed from a weak base (NH4OH) and a weak acid (H2CO3). Therefore, it is approximately neutral.

3. **Determine the Correct Answer**:
From the analysis, only **Option 3 (KOH + H2CO3)** will give a basic solution upon hydrolysis due to the presence of the strong base (KOH) dominating over the weak acid (H2CO3).

### Conclusion:
The salt that will give a basic solution on hydrolysis is **K2CO3** (from KOH and H2CO3).