Question

Study the following reactions and mark the correct properties shown by water.
(i) $SO_3 + H_2O \to H_2SO_4$
(ii) $Cl_2O_7 + H_2O \to 2HClO_4$
(iii) $CaO + H_2O \to Ca(OH)_2$
(iv) $Na_2O + H_2O —\to 2NaOH$

• A. All oxides react with water to give hydroxides
• B. Acidic oxides are formed by metals and basic oxides by non-metals
• C. Non-metal oxides combine with water to form acids while metallic oxides combine with water to form alkalies
• D. Acidic oxides are stronger than basic oxides since they form strong acids

Answer 1

Answer: (C)

Acidic oxides form acids while basic oxides form alkalies with water.