Give the correct answer to the following questions:
Anu performs an activity by taking a few drops of lemon juice in a test tube and diluting it with water. A drop of blue litmus solution is added, and the colour changes. Then lime water is added slowly with constant shaking. After some time, the colour changes again. Finally, a drop of lemon juice is added once more.
1. Why does the colour of the solution change from red to blue after adding lime water?
2. What is the nature of lime water added to the test tube?
3. What type of reaction takes place when lemon juice reacts with lime water?