Question

A strip of absolutely clear cloth is sprayed with onion juice. The strip is then rubbed with few drops of hydrochloric acid. Will the strip smell like onion? Give a reason for your answer.

Answer 1

yes it will smell like
onion is a olfactory indicator which doesnot change its smell when added to an acid
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Answer 2

Answer: Yes, the strip will smell like an onion.

Explanation:

Onion is a common example of an olfactory indicator.

Olfactory indicators are defined as the indicators whose smell vary depending on its mixing with acidic or basic solutions. These are used to detect whether the solution is acidic or basic. The titrations in which they are used is known as olfactory titrations.

Onion smells like an onion when it is dipped in an acidic solution because the smell causing component of onion is an acid but when it is reacted with base, it forms salt and hence, looses its smell.

Hence, the strip will smell like an onion when it is first dipped in onion juice and then in hydrochloric acid.