Question:
Phenol is a highly corrosive substance, but its 0.2 per cent solution is used as
Phenol is a highly corrosive substance, but its 0.2 per cent solution is used as
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Phenol:
Low concentration → antiseptic
High concentration → disinfectant
High concentration → disinfectant
Updated On: May 1, 2026
- antibiotic
- antiseptic
- disinfectant
- antihistamine
- antacid
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Phenol (C$_6$H$_5$OH) is an aromatic compound with strong germicidal properties. It is toxic and corrosive in concentrated form but becomes useful in diluted form.
Step 1: Understanding concentration effect
• High concentration → corrosive and toxic
• Low concentration (0.2%) → kills microorganisms without damaging tissues significantly
Step 2: Difference between antiseptic and disinfectant
• Antiseptic: Applied on living tissues (safe in low concentration)
• Disinfectant: Used on non-living objects (higher concentration)
Step 3: Application of phenol
At 0.2% concentration, phenol is safe for use on skin → acts as an antiseptic.
Step 4: Analysis of options
• (A) Antibiotic → acts inside body → incorrect
• (B) Antiseptic → correct
• (C) Disinfectant → requires higher concentration
• (D) Antihistamine → unrelated
• (E) Antacid → unrelated Final Conclusion: \[ \boxed{(B)} \]
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