Select the correct orders of increasing acidic strength among the following series: — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Going down a group in the periodic table, the atomic size increases, weakening the H-A bond, which makes releasing a proton easier. Thus, acidity increases down the halogen, chalcogen, and pnictogen groups (options A, B, and C). For oxoacids of the same element, acidic strength increases with the central atom's oxidation state, making D incorrect ($HClO_4$ is the strongest).