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

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

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

  1. Litmus
  2. Turmeric
  3. Vanilla essence
  4. Petunia leaves

Answer: Vanilla essence

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