Which of the following(s) is/are olfactory indicators?

Litmus

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Onion

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Clove

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Red cabbage

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Solution

The correct options are
B
Onion

C
Clove

Indicators which changes their odour in acidic and basic medium are called olfactory indicators. Onion and Clove are olfactory indicators.

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What do you mean by olfactory indicators?

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