Question

Among the following, the most basic oxide is

(a) Al₂O₃

(b) P₂O₅

(c) SiO₂

(d) Na₂O

Answer 1

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.