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Question

Which of the following is an olfactory indicator?

A
Litmus
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B
Turmeric
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C
Onion
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D
Phenolphthalein
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Solution

The correct option is C Onion
Substances which change their smell when mixed with an acid or base are known as olfactory indicators. For example onion, vanilla extract, clove oil, etc. Paste or juice of onion gives pungent smell when treated with a base and gives no smell when treated with an acid.

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