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Get Answers to all your Questions
Which one of the following can be used as an acid-base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves
Answers (1)
Answer: (c)
Vanilla essence is an olfactory indicator. So, its smell is different in acidic and basic media, which can be detected easily by a visually impaired student. If a basic solution is added to vanilla extract, then we cannot detect the characteristic smell of vanilla extract. An acidic solution does not destroy the smell of vanilla extract.
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