Question

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-
(a) Lemon juice
(b) Vinegar (c) Common salt (d) An antacid​

Answer 1

Explanation:

An antacid because antacid is a base

Answer 2

$\bf\huge\underline\purple{Answer}$

(d) An antacid

Because pH paper turns greenish blue for weakly basic compound and antacids contain weak base like NaHCO3.