Q.

There are some substances whose odor changes in acidic or basic media. These are called -

A. Olfactory indicators
B. Litmus indicator
C. Gustatory indicators
D. All of the above
Answer» A. Olfactory indicators
Explanation: An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Onion , clove oil and vanilla extract are examples.
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