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Questions  

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

a
K2O<Na2O<Al2O3<MgO
b
Al2O3<MgO<Na2O<K2O
c
MgO<K2O<Al2O3<Na2O
d
MgO<K2O<Na2O<Al2O3

detailed solution

Correct option is B

The metallic nature of an element (and hence its basic nature of oxide) increases on descending a group and it decreases along the period. Thus, least basic oxide is Al2O3 and the strongest basic oxide is K2O.

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