The most basic oxides is :

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MgO

Al2O3

P2O5

Cl2O7

answer is A.

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Detailed Solution

Concept- The size of the central atom, its level of oxidation, and the element's metallic nature all affect how basic an oxide is. More metallic oxides are present in larger sizes, which raises basicity.
The elements in the periodic table combine with oxygen to form their respective oxides. The metal oxides are most basic in nature .The alkali and alkaline earth metal which are present in extreme left side or in group 1-2 are metal oxides and are most basic in nature so in the given options there is only one metal which is Mg the metal oxides MgO is most basic in nature .
Hence, the correct option is (1).

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