Engineering
Chemistry
Application of Electronegativity
Question

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

Al2O3 < MgO < Na2O < K2O

MgO < K2O < Al2O3 < Na2O

K2O < Na2O < Al2O3 < MgO

Na2O < K2O < MgO < Al2O3

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Solution

As metallic character of element attached to oxygen atom increases, 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.