Chemistry - Complete Pblock- Question with Solution | TestHub

Boric acid ($H_{3}B{O}_3$) is commonly used as a mild antiseptic, particularly in dilute aqueous solutions, for minor cuts, burns, and eye washes. It exhibits mild antibacterial and antifungal properties without being overly harsh on tissues.

Explanation:

Option 2, $H_{3}B{O}_3$ (aq.), represents boric acid in an aqueous solution. Boric acid is well-known for its antiseptic properties and is found in various over-the-counter products. The other options, $H_{4}Si{O}_4$ (silicic acid), $HP{O}_2$ (metaphosphorous acid), and $HNO$ (nitroxyl), do not share this common application as a mild antiseptic.