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
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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
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Vanilla essence is an olfactory indicator