Discussion
Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?
Answer: B
The correct order is \(\mathrm{Al_2O_3 < MgO < Na_2O < K_2O}\).
Basicity of an oxide increases as the element becomes more metallic - that is, down a group and to the left across a period. \(\mathrm{Al_2O_3}\) is amphoteric, MgO weakly basic, and \(\mathrm{Na_2O}\) and \(\mathrm{K_2O}\) strongly basic, with potassium the most electropositive of the four.
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