Which of the following can be used in the laboratory to test whether a solution is a base or an acid?
Acid indicator
Olfactory indicator
Basic indicator
Regular indicator
A
Acid indicator
B
Olfactory indicator
C
Basic indicator
D
Regular indicator
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Solution
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An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.
Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.
For eg, onion loses its characteristic smell in basic solution and retains its smell in acidic solution.
Hence, option A is correct.
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