CBSE Class 10 Science 2019 Outside Delhi Set 1

Question : 8 of 27

Marks: +1, -0

What are amphoteric oxides ? Give an example. Write balanced chemical equations to justify your answer.

Solution:

Those oxides which behave both as acidic and basic oxides are called amphoteric oxides.
Example:

{\Al}_2 {\O}_3

(Alumina)
(i)

{ {\Al}_2 {\O}_}↙{\text "Alumina"}3+{6 {\HCl}}↙{\text "Acid"} → {2 {\AlCl}_3}↙{\text "Salt"}+3 {\H}_2 {\O}

(ii)

{ {\Al}_2 {\O}_3}↙{\text "Alumina"}+{2 {\NaOH}}↙{\text "Base"} →{ 2 {\NaAlO}_2}↙{\text " Salt"}+ {\H}_2 {\O}

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