... Write the formula for the acid formed from the fluoride anion, and then name the acid Ans: HF, hydrofluoric acid Category: Medium Section: 2.7 121 Write the formula for the acid formed from the ... nitrite anion, and then name the acid Ans: HNO2, nitrous acid Category: Medium Section: 2.7 122 Write the formula for the acid formed from the permanganate anion, and then name the acid Ans: HMnO4, ... 123 Write the formula for the acid formed from the hydrogen sulfate anion, and then name the acid Ans: H2SO4, sulfuric acid Category: Difficult Section: 2.7 124 The elements known as the halogens...