Properties and classifications of oxides Steps: - Classify oxides: acidic (non-metal, react with bases), basic (metal, react with acids), amphoteric (react with both). - Test statement B: Basic oxides like Na2O form NaOH (alkali) with water, but CuO reacts with HCl (CuO + 2HCl → CuCl2 + H2O) yet remains insoluble in water. - Confirm not all basic oxides are soluble; transition metal oxides like Fe2O3 are basic but do not dissolve to form alkalis. - Thus, B overgeneralizes solubility as a universal trait. Why B is correct: - Basic oxides neutralize acids per Arrhenius definition, but solubility in water to form alkalis applies only to group 1/2 oxides; insoluble ones like CuO disprove "all." Why the others are wrong: - A: Standard acidic oxides (CO2, SO2, NO2) are gases at room temperature. - C: Amphoteric oxides like ZnO react with acids (ZnO + 2HCl → ZnCl2 + H2O), alkalis (ZnO + 2NaOH → Na2ZnO2 + H2O), and water (ZnO + H2O → Zn(OH)2). - D: K2O + H2O → 2KOH, a classic basic oxide reaction forming an alkali. Final …