Question

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

Medium

Solution

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Correct option is C)

An acid base indicator shows a colour change from red to blue or blue to red which is not recognisable by a visually impaired student. To detect this change, an olfactory indicator is required which gives a particular odour during this colour change. So vanilla essence is used because of its fruity smell.

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