You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

Explanation

To identify the contents of each test tube using only red litmus paper, follow these steps:

### Step-by-Step Solution:

1. **Label the Test Tubes**: Let's label the test tubes as A, B, and C for clarity. We know that one contains distilled water, one contains an acidic solution, and one contains a basic solution.

2. **Dip Red Litmus Paper in Test Tube A**: Start by dipping the red litmus paper into test tube A. Observe any color change.
- **Expected Result**: If there is no color change, it means test tube A contains distilled water (a neutral solution).
...