Question

Which of the following can be used as olfactory indicators?

• A. Vanilla essence, turmeric and clove oil
• B. Red cabbage, vanilla essence and onion
• C. Turmeric, onion and litmus
• D. Vanilla essence, onion and clove oil

Hint:

Olfactory indicators are identified by a change in their odor in acidic or basic media.

Answer 1

The Correct Option is D

Step 1: Recall the definition of olfactory indicators.
Olfactory indicators change their smell depending on whether they are in an acidic or basic solution.
Step 2: Evaluate the olfactory properties of each substance.
Vanilla essence: Smell changes in basic solution.
Turmeric: Primarily a visual indicator (color change).
Clove oil: Smell changes in basic solution.
Red cabbage: Primarily a visual indicator (color change).
Onion: Smell changes in basic solution.
Litmus: A visual indicator (color change).
Step 3: Identify the set containing only olfactory indicators.
Vanilla essence, onion, and clove oil all exhibit a change in smell in basic conditions.