Acids turn blue litmus

Options

A. green
B. red
C. yellow
D. orange

Answer

To answer the question "Acids turn blue litmus paper in which color?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Litmus Paper**:
- Litmus paper is a pH indicator used to determine whether a solution is acidic or basic. It comes in two colors: red and blue.

2. **Identifying the Color Change**:
- Blue litmus paper is specifically used to test for acidity. When an acidic solution is applied to blue litmus paper, a color change occurs.

3. **Color Change of Blue Litmus Paper**:
- When blue litmus paper comes into contact with an acidic solution, it turns red. This indicates that the solution is acidic.

4. **Conclusion**:
- Therefore, acids turn blue litmus paper red.

### Final Answer:
Acids turn blue litmus paper red.