(D) The acidity of oxides increases as we move from left to right across a period in the periodic table. $Na_2O$ and $MgO$ are basic oxides because th

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(D) The acidity of oxides increases as we move from left to right across a period in the periodic table. $Na_2O$ and $MgO$ are basic oxides because they are oxides of metals. $ZnO$ is an amphoteric oxide. $P_2O_5$ is an oxide of a non-metal,which makes it acidic in nature. Therefore,$P_2O_5$ is the most acidic oxide among the given options.