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Question

Which of the following oxides is amphoteric in character?


  1. SiO2     

  2. SnO2

  3. CO2            

  4. CaO


Solution

The correct option is B

SnO2


CaO is basic as it form strong base Ca(OH)2 on reaction with water.

CaO + H2OCa(OH)2

CO2 is acidic as it dissolve in water forming ustable carbonic acid.

H2O + CO2H2CO3

Silica (SiO2) is insoluble in water and acts as a very weak acid.

SnO2 is amphoteric as it reacts with both acid and base.

SnO2 + 2H2SO4Sn(SO4)2+2H2O

SnO2 + 2KOHK2SnO3 + H2O

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