Choose the correct statement:

Options

A. `pH` of acidic buffer solution decrease if more salt is added
B. `pH` of acidic solution increases if more salt is added.
C. `pH` of basic buffer increase if more salt is added.
D. `pH` of basic buffer increase if more salt is added.

Explanation

To solve the question, we need to analyze the statements regarding the behavior of buffer solutions when additional salt is added. Let's break it down step by step.

### Step 1: Understand Buffer Solutions
Buffer solutions are designed to resist changes in pH when small amounts of acids or bases are added. There are two types of buffers:
- **Acidic Buffer**: Made from a weak acid and its salt. Example: Acetic acid and sodium acetate.
- **Basic Buffer**: Made from a weak base and its salt. Example: Ammonium hydroxide and ammonium chloride.

### Step 2: Analyze Each Statement
1. **Statement 1**: "pH of acidic buffer solution decreases if more salt is added."
- **Analysis**: According to the Henderson-Hasselbalch equation, adding more salt (which increases the concentration of the salt component) will increase the pH of the acidic buffer. Therefore, this statement is **incorrect**.

2. **Statement 2**: "pH of acidic solution increases if more salt is added."
- **Analysis**: As explained above, adding more salt to an acidic buffer increases the pH. Therefore, this statement is **correct**.

3. **Statement 3**: "pH of basic buffer increases if more salt is added."
- **Analysis**: For a basic buffer, adding more salt increases the pOH (because it increases the concentration of the salt), which in turn decreases the pH (since pH + pOH = 14). Therefore, this statement is **incorrect**.

4. **Statement 4**: "pH of basic buffer decreases if more salt is added."
- **Analysis**: As explained, adding more salt to a basic buffer increases the pOH and decreases the pH. Therefore, this statement is **correct**.

### Step 3: Conclusion
The correct statements are:
- Statement 2: "pH of acidic solution increases if more salt is added."
- Statement 4: "pH of basic buffer decreases if more salt is added."

### Final Answer
The correct statements are:
- **Statement 2** and **Statement 4**.