Question

(a)Classify following oxides as neutral, acidic, basic or amphoteric: 

CO, B₂O₃, SiO₂, CO₂, Al₂O₃, PbO2, Tl₂O₃ 

(b)Write suitable chemical equations to show their nature. 

Answer 1

(1) CO = Neutral 

(2) B2O₃ = Acidic 

Being acidic, it reacts with bases to form salts. It reacts with NaOH to form sodium metaborate. 

(3) SiO₂ = Acidic 

Being acidic, it reacts with bases to form salts. It reacts with NaOH to form sodium silicate. 

(4) CO₂ = Acidic 

Being acidic, it reacts with bases to form salts. It reacts with NaOH to form sodium carbonate. 

(5) Al₂O₃ = Amphoteric 

Amphoteric substances react with both acids and bases. Al₂O₃ reacts with both NaOH and H₂SO₄. 

(6) PbO₂ = Amphoteric 

Amphoteric substances react with both acids and bases. PbO₂ reacts with both NaOH and H₂SO₄. 

(7) Tl₂O₃ = Basic 

Being basic, it reacts with acids to form salts. It reacts with HCl to form thallium chloride.