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:

\mathrm{Al}_2\mathrm{O}_3

(Alumina)

(i)

\underset{\text{Alumina}}{\mathrm{Al}_2\mathrm{O}_3} + \underset{\text{Acid}}{6\mathrm{HCl}} \rightarrow \underset{\text{Salt}}{2\mathrm{AlCl}_3} + 3\mathrm{H}_2\mathrm{O}

(ii)

\underset{\text{Alumina}}{\mathrm{Al}_2\mathrm{O}_3} + \underset{\text{Base}}{2\mathrm{NaOH}} \rightarrow \underset{\text{Salt}}{2\mathrm{NaAlO}_2} + \mathrm{H}_2\mathrm{O}

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