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

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo