Among the following, the most basic oxide is
(a) Al2O3
(b) P2O5
(c) SiO2
(d) Na2O
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Answer is : (d) Na2O
All the central atom of the given oxide belong to 2nd period, as we move from left to right in a period the basicity of oxide decreases.
∴ The order of increasing basicity of oxide would be P2O5 < SiO2 < Al2O3 < Na2O
Thus, the most basic oxide would be Na2O.