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Q.

Which of the following cannot be used as olfactory indicators?

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a

Onion 

b

Vanilla extract 

c

Clove oil 

d

Turmeric 

answer is D.

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Detailed Solution

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An Olfactory indicator is a substance whose smell varies when mixed with an acidic or basic solution. Vanilla, onion, and clove, can be used as olfactory indicators whereas turmeric is not.

Turmeric is yellow in acid and neutral substances but turns bright red with bases. its smell does not vary when it is mixed with an acidic or basic solution.

 Hence, Turmeric is not an Olfactory Indicator but a Natural Indicator.

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