Question 7 - MCQs from NCERT Exemplar - Chapter 2 Class 10 - Acids, Bases and Salts

Last updated at August 14, 2026 by

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



Answer

Universal Indicator-Teachoo.jpg

Now,

  • Yellowish-orange color indicates that the soil is slightly acidic .
  • In order to change the color to greenish blue, we add a base so that the pH is increased .

 

Among the following options, 

  • Lemon juice and vinegar are acidic, 
  • common salt is neutral and
  •   antacid is basic.

 

So, the correct option is (d) an antacid

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