Boric acid is used as an _____.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Antiseptic
Boric acid (H3BO3) is a weak acid that stops the growth of bacteria and fungi, so a dilute solution or powder is used as a mild antiseptic, for example to wash the eyes and to dress minor cuts and burns.
Why the other options are incorrect
Option (1) Antipyretic — Incorrect. An antipyretic lowers fever, like paracetamol; boric acid does not.
Option (2) Analgesic — Incorrect. An analgesic relieves pain, like aspirin; boric acid is not a painkiller.
Option (4) Catalytic agent — Incorrect. A catalyst speeds up a chemical reaction without being used up; this is not the use boric acid is known for.