Match List-I with List-II: List-I: (A) Litmus, (B) Nitrogen, (C) Calcium Hydroxyapatite, (D) Hydrogen Peroxide List-II: (1) Tooth enamel, (2) Anti-microbial agent, (3) Chips sealed in packet, (4) Lichen Choose the correct answer:
Question:
Match List-I with List-II: List-I: (A) Litmus, (B) Nitrogen, (C) Calcium Hydroxyapatite, (D) Hydrogen Peroxide List-II: (1) Tooth enamel, (2) Anti-microbial agent, (3) Chips sealed in packet, (4) Lichen Choose the correct answer:
Match List-I with List-II: List-I: (A) Litmus, (B) Nitrogen, (C) Calcium Hydroxyapatite, (D) Hydrogen Peroxide List-II: (1) Tooth enamel, (2) Anti-microbial agent, (3) Chips sealed in packet, (4) Lichen Choose the correct answer:
Options
Answer: (1) A-4, B-3, C-1, D-2
Explanation:
Litmus (A) is a natural pH indicator extracted from lichens (specially Rocella tinctoria and other lichen species) — it turns red in acid and blue in alkali (4). Nitrogen (B) is used in sealed packets of chips/snack foods to prevent oxidation and maintain freshness while keeping the packet inflated (3). Calcium Hydroxyapatite (C) is the primary mineral component of tooth enamel and bone — it gives teeth their hardness and strength (1). Hydrogen Peroxide (H₂O₂) (D) is a well-known antimicrobial/disinfectant agent used in wound cleaning, teeth whitening, and as a bleaching agent (2). Hence correct match: A-4, B-3, C-1, D-2.
Explanation:
Litmus (A) is a natural pH indicator extracted from lichens (specially Rocella tinctoria and other lichen species) — it turns red in acid and blue in alkali (4). Nitrogen (B) is used in sealed packets of chips/snack foods to prevent oxidation and maintain freshness while keeping the packet inflated (3). Calcium Hydroxyapatite (C) is the primary mineral component of tooth enamel and bone — it gives teeth their hardness and strength (1). Hydrogen Peroxide (H₂O₂) (D) is a well-known antimicrobial/disinfectant agent used in wound cleaning, teeth whitening, and as a bleaching agent (2). Hence correct match: A-4, B-3, C-1, D-2.
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