Single Answer MCQ
Q-00039875
Which substance acts as an olfactory indicator?
1
Litmus
2
Cabbage juice
3
Vanilla essence
4
Phenolphthalein
Answer and Solution
Answer
C. Vanilla essence
Solution:
Vanilla essence can change its odor in the presence of acids or bases, thus acting as an olfactory indicator. The others listed do not change smell.
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