Question

34.
Which one of the following is most acidic oxide ?
(A) Na20
(B) Mgo
(C) Al2O3
(D) CaO
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Answer 1

Answer:

Alkali metal oxide is most basic: Na2O

Aluminium oxide is amphoteric : Al2O3

Non metallic oxide is acidic: Cl2O7

Answer 2

Answer:

(C) Al2O3

Explanation:

higher the oxidation state of a metal higher is it's acidic nature. oxidation state is directly proportional to acidic nature.

Na2O oxidation state of Na = +1.

Mgo oxidation state of mg = +2.

Al2O3 oxidation state of Al = +3.

cao oxidation state of call = +2