pH values of four solutions A, B, C and D are 1, 2, 3, 7 respectively. Put them in a sequence according to their nature.

Options

A. Acidic, acidic, acidic, neutral
B. Neutral, basic, basic, basic
C. Acidic, neutral, basic, basic
D. Acidic, Acidic, neutral, basic

Answer

To solve the question, we need to categorize the solutions A, B, C, and D based on their pH values. The pH scale ranges from 0 to 14, where:

- A pH less than 7 indicates an acidic solution.
- A pH of 7 indicates a neutral solution.
- A pH greater than 7 indicates a basic (alkaline) solution.

Given the pH values:

- Solution A: pH = 1
- Solution B: pH = 2
- Solution C: pH = 3
- Solution D: pH = 7

### Step-by-Step Solution:

1. **Identify the Nature of Each Solution:**
- **Solution A (pH = 1)**: Acidic (since 1 < 7)
- **Solution B (pH = 2)**: Acidic (since 2 < 7)
- **Solution C (pH = 3)**: Acidic (since 3 < 7)
- **Solution D (pH = 7)**: Neutral

2. **Classify the Solutions:**
- Acidic solutions: A, B, C
- Neutral solution: D

3. **Arrange the Solutions in Sequence:**
- Since we need to arrange them according to their nature, we will list the acidic solutions first, followed by the neutral solution.
- The order of acidic solutions based on their pH values (from lowest to highest) is:
- A (pH = 1)
- B (pH = 2)
- C (pH = 3)
- Finally, we add D (pH = 7) at the end.

4. **Final Sequence:**
- The sequence according to their nature is: A, B, C, D.

### Final Answer:
The sequence of the solutions according to their nature is: **A, B, C, D**.