Q
Match the following: (i) red cabbage leaves (ii) methyl orange (iii) Onion, clove (a) olfactory indicator (b) acid base indicator (c) natural acid base indicator
RRB Group D, 18-Aug-22 S-1
2022
✓ Answer:
B
(i)-c, (ii)-b, (iii)-a
Red cabbage leaves act as a natural acid-base indicator (i-c) because they contain anthocyanin, which changes color in response to pH. Methyl orange is a synthetic acid-base indicator (ii-b) commonly used in titrations. Onion and clove are olfactory indicators (iii-a), as their smell can help detect the presence of acids or bases.
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