Question

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH papwer yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue ?
A. Lemon juice
B. Vinegar
C. Common salt
D. An antacid

Answer 1

Correct Answer - B
The colour of the pH paper signifies that the solution is somewhat acidic. In order to change it to greenish-blue, we need an antacid.