A blue litmus paper was first dipped in dil .HCl and then in dil .NaOH solution .It was observed that the colour of the litmus paper

Options

A. changed to red
B. changed first to red and then to blue
C. changed blue to colourless
D. remained blue in both the solutions .

Explanation

To solve the question regarding the color change of a blue litmus paper when dipped first in dilute HCl and then in dilute NaOH, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Initial Condition**:
- We start with a blue litmus paper.

2. **First Dip in Dilute HCl**:
- HCl is a strong acid. When blue litmus paper is dipped in an acid, it changes color from blue to red.
- Therefore, after this step, the litmus paper will be red.

3. **Second Dip in Dilute NaOH**:
- NaOH is a strong base. When red litmus paper is dipped in a base, it changes color from red back to blue.
- Therefore, after this step, the litmus paper will return to blue.

4. **Final Observation**:
- After dipping the blue litmus paper in dilute HCl and then in dilute NaOH, the final color of the litmus paper is blue.

### Conclusion:
The color of the litmus paper after these two dips is blue.

### Answer:
The correct option is: "changed from blue to red and then back to blue."

---