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Q.

Which one of the following metal oxides shows both acidic and basic characters?

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a

CuO

b

Na2O

c

Al2O3

d

K2O

answer is D.

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Detailed Solution

Amphoteric oxide shows both acidic and basic characters

Ex: Al2O3,  ZnO .

Al2O3 can react with bases to form mixed salts and can also react with acids as well.

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