Chemistry Classification of Elements and Periodicity Development of Periodic Table, Period, Group and Block Single Correct MCQ
Published on: August 13, 2026

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

A
Al2O3 <MgO< Na2O < K2O
B
MgO< K2O < Al2O3 < Na2O
C
Na2O < K2O <MgO< Al2O3
D
K2O < Na2O < Al2O3<MgO

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Text Solution

Verified by Experts
The correct answer is:
A

As metallic character of element attached to oxygen atom increases (on moving top to bottom or right to left in Modern periodic table), the difference between the electronegativity values of element and oxygen increases and thus basic character of oxides increases and vice-versa. Hence the increasing correct order of basic nature is Al2O3 < MgO < Na2O < K2O.

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