Question:
Gastric lavage is NOT contraindicated after ingestion of which acid?
Gastric lavage is NOT contraindicated after ingestion of which acid?
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One corrosive is the famous exception where lavage is still allowed - phenol.
Updated On: Jun 23, 2026
- HCl
- H2SO4
- Carbolic acid
- Nitric acid
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Gastric lavage is generally contraindicated in corrosive poisoning, because passing a tube can perforate an already damaged, friable oesophagus or stomach. This applies to alkalis, mineral acids and most organic acids.
Step 2: Hydrochloric acid, sulphuric acid and nitric acid are strong mineral corrosives, so lavage is contraindicated for all three, ruling out options (a), (b) and (d).
Step 3: Carbolic acid (phenol) is the single important exception. It is corrosive but lavage is still permitted and useful, making option (c) correct.
Step 4: Therefore the acid after which gastric lavage is NOT contraindicated is carbolic acid.
Step 2: Hydrochloric acid, sulphuric acid and nitric acid are strong mineral corrosives, so lavage is contraindicated for all three, ruling out options (a), (b) and (d).
Step 3: Carbolic acid (phenol) is the single important exception. It is corrosive but lavage is still permitted and useful, making option (c) correct.
Step 4: Therefore the acid after which gastric lavage is NOT contraindicated is carbolic acid.
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