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(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. 

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(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. 

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