Question

Classify these oxides as acidic basic amphoteric or neutral b2o3 , sio2 , al2o3 , pbo2 , tl2o3

Answer 1

Answers

(a) neutral oxides : CO

acidic oxides : B2O3 , SiO2 , CO2

basic oxides : Tl2O3 ,

Amphoteric oxides : Al2O3 , PbO2

(b) (i) being acidic B2O3 , SiO2 and CO2 react with alkali to form salts .

B2O3 + 2NaOH -----> 2NaBO2 + H2O;

SiO2 + 2NaOH ------> Na2SiO3 + H2O;

CO2 + 2NaOH -------> Na2CO3 + H2O

(ii) being Amphoteric , Al2O3 and PbO2 react with both acids and bases .

Al2O3 + 3H2SO4 ------>Al2(SO4)3 + 3H2O

Al2O3 + 2NaOH -------> NaAlO2 + H2O

2PbO2 + 2H2SO4 ----->PbSO4 + 2H2O +O2

PbO2 + 2NaOH -------> Na2PbO3 + H2O

(iii) Being basic Tl2O3 reacts with acid .

Tl2O3 + 6HCl ------> 2TlCl3 + 3H2O

Hope this helps