![Which one of the following can be used as an acid–base indicator by a visually impared student](https://www.gkseries.com/blog/wp-content/uploads/2021/12/Which-one-of-the-following-can-be-used-as-an-acid–base-indicator-by-a-visually-impared-student.jpg)
Q. Which one of the following can be used as an acid–base indicator by a visually impared student?
- Litmus
- Turmeric
- Vanilla essence
- Petunia leaves
Answer: Vanilla essence
Answer: Vanilla essence
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