Olfactory Indicators indicate presence of acid or base by change in ______.

colour

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temperature

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smell

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taste

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Solution

The correct option is C smell
Olfactory indicators indicate the presence of acid or base by a change in their smell. Some examples of olfactory indicators are onion, vanilla essence, clove oil, etc.

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Olfactory indicators respond to acid or base by change in smell.

Say True or False.

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