![A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish- blue?](https://www.gkseries.com/blog/wp-content/uploads/2021/12/A-sample-of-soil-is-mixed-with-water-and-allowed-to-settle.png)
Q. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish- blue?
- Lemon juice
- Vinegar
- Common salt
- An antacid
Answer: An antacid