Among the following,the most basic oxide is

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(D) The correct option is $D$. In the periodic table,as we move from left to right across a period,the metallic character decreases and the non-metall

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$Na_2O$

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(D) The correct option is $D$. In the periodic table,as we move from left to right across a period,the metallic character decreases and the non-metallic character increases. Consequently,the basic nature of the oxides decreases,and the acidic nature increases. Comparing the given oxides: $Na_2O$ (alkali metal oxide),$Al_2O_3$ (amphoteric oxide),$SiO_2$ (acidic oxide),and $P_2O_5$ (acidic oxide). $Na_2O$ is the most basic oxide because $Na$ is an alkali metal. The order of basicity is $P_2O_5 < SiO_2 < Al_2O_3 < Na_2O$.

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