Discussion
Match List I with List II and choose the correct answer from the given options.
| List-I | List-II |
|---|---|
| A. Litmus | 1. Tooth enamel |
| B. Nitrogen | 2. Anti microbial agent |
| C. Calcium Hydroxyapatite | 3. Chips sealed in packet |
| D. Hydrogen Peroxide | 4. Lichen |
Answer: A
The correct matching is A-4, B-3, C-1, D-2.
- Litmus, the acid-base indicator, is extracted from lichens.
- Nitrogen, an unreactive gas, is flushed into packets of chips to keep out oxygen and stop the oil going rancid.
- Calcium hydroxyapatite is the mineral of tooth enamel, the hardest substance in the body.
- Hydrogen peroxide is used as an antiseptic, an anti microbial agent.
Options pairing nitrogen or litmus with anything else break one of these standard textbook links.
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