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? [NCERT Exemplar]
A. Lemon juice
B. Vinegar
C. Common salt
D. An antacid
Answer:D
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? [NCERT Exemplar]
A. Lemon juice B. Vinegar C. Common salt D. An antacid