Multiple choice general knowledge Which chemical compound is used for the etching of glass? sodium bicarbonate carbon monoxide hydrofluoric acid nitric acid Reveal answer Fill a bubble to check yourself C Correct answer Explanation Hydrofluoric acid (HF) is used to etch glass because it reacts with silicon dioxide (SiO2), the main component of glass. This reaction produces silicon tetrafluoride and water, permanently marking the glass surface.