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प्रश्न
Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?
पर्याय
Turmeric
Vanilla essence
Methyl orange
Litmus
MCQ
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उत्तर
Vanilla essence
Explanation:
A visually impaired student cannot rely on colour change, so an olfactory indicator is used. Vanilla essence changes its smell in acidic and basic solutions, making it suitable for detection without vision.
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