A sample of soil is mixed with water and allowed to settle.

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-blue ?

(a) Lemon juice

(b) Vinegar

(c) Common salt

(d) An antacid

Solution:

(d). 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.

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