Answer:
(c)
Vanilla essence is an olfactory indicator. So, its smell is different in
acid and basic media which can be detected easily by a visually impared
student. Vanilla extract has a characteristic pleasant smell.
If a basic solution like sodium
hydroxide solution is added to vanilla extract then we cannot detect the
characteristic smell of vanilla extract. An acidic solution like hydrochloric
acid, however, does not destroy the smell of vanilla extract.
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