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Read the given passage and answer the qu...

Read the given passage and answer the questions.
P, Q, R are different colourless solids, while S is a colourless solution. They are in random order) Sodium chloride (NaCl), Calcium Carbonate `(CaCO_(3))`, Acetic acid `(CH_(3)COOH)` and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q, Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table.
Observation Table:

The chemicals that can be used as an acid base indicator by a visually impaired student is _____ .

A

Petunia leaves

B

Vanilla essence

C

Phenolphthalein

D

Turmeric

Text Solution

Verified by Experts

The correct Answer is:
B
Vanilla essence can be used as an acid-base indicator by visually impaired students as it is an olfactory indicator whose odour changes in acidic or basic media.
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