Based on the variations of electronegativity and acid-base character across the periodic table, whic — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Carbon dioxide ($CO_2$) is an acidic non-metal oxide. To strongly absorb it, a highly basic compound is required (acid-base neutralization). $K_2O$ is an oxide of an extremely electropositive alkali metal (low EN), making it highly basic. $BeO$ is amphoteric, and the phosphorus compounds are acidic. Thus, $K_2O$ is the strongest absorber.