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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...
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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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