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Question

can be used to test the presence of a base.

A

Onion

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B

Cinnamon

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C

Black pepper

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D

Cardamom

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Solution

The correct option is A Onion
Clove, vanilla, and onion are olfactory indicators that lose their odour in the presence of a base. However, in the presence of an acid, there occurs no change in the odour.

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