Which one of the following can be used as an acid–base indicator by a visually impared student?

(A) Litmus

(B) Turmeric

(C) Vanilla essence

(D) Petunia leaves




For visually impaired students, we need an Olfactory indicator . Which smells different in acids and bases.

Indicators of acids and bases-Teachoo.jpg

Vanilla essence can be used as an acid-base indicator by visually impaired students as it is an olfactory indicator whose odour changes in acidic or basic media.


So, the correct answer is (c) vanilla essence

  1. Class 10
  2. Chapter 2 Class 10 - Acids, Bases and Salts (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo