alleryStart learning →Onion and clove, which can distinguish acids from bases by smell, are examples of
Asynthetic indicators
Bolfactory indicators
Cuniversal indicators
Dlitmus indicators
Answer & Solution
Correct answer: B. olfactory indicators
1. Some substances change (or lose) their smell in acidic or basic media.
2. Such smell-based indicators (onion, clove, vanilla) are called **olfactory indicators**.
3. They are useful for visually-impaired students.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch2 'Acids, Bases and Salts', §2.1_
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