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Q)

Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides ?


( A ) $Na_2O < K_2O < MgO < Al_2O_3$
( B ) $MgO < K_2O < Al_2O_3 < Na_2O$
( C ) $Al_2O_3 < MgO < Na_2O < K_2O$
( D ) $ K_2O < Na_2O < Al_2O_3 < MgO $

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A)
Option A) is the ans. Because here , Al and Mg have +3 and +2 state. And K and Na have +1 and +1 state resp. As the basic nature increases down the group so here K> Na . And Also Al > Mg due to higher electropositive .
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