CBSE Class 10 Science 2023 Outside Delhi Set 1

Question : 1

Total: 39

Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
I. MgO
II. ZnO
III. Al2O3
IV. CaO

I and II
II and III
III and IV
I and IV

Solution:

Explanation: Some metal oxides, such as aluminium oxide, zinc oxide shows both acidic as well as basic behaviour. Such metal oxides which react with both acids as well as bases to produce salt and water are known as amphoteric oxides.
Aluminium oxide reacts with base as follows:
Al2O3+2‌NaOH→

2NaAlO2+

(Sodium aluminate)

H2O
ZnO is an oxide that can react with base, as shown by the equation given below:
ZnO+2‌NaOH→Na2ZnO2+H2O.

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