1.

Which of the following oxide is amphoteric ?(a) SnO2 (b) CaO (c) SiO2 (d) CO2

Answer»

(a) SnO2 is an amphoteric oxide because it reacts with acids as well as with bases to form corresponding salts. SnO2 + 2H2 SO4 (conc) → Sn(SO4 ) 2 + 2H2O , SnO2 + 2NaOH → Na2 SnO3 + H2O



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