Multiple choice general knowledge science & technology Hydrochloric acid HCl NaOH AgBr KBr Reveal answer Fill a bubble to check yourself A Correct answer Explanation Hydrochloric acid has the chemical formula HCl, formed from hydrogen (H) and chlorine (Cl). It's a strong acid found in gastric juice and used industrially. NaOH is sodium hydroxide (a base), AgBr is silver bromide, and KBr is potassium bromide.