Among 

a) Na₂O; 

b) MgO;
c) Al₂O₃: 

d) P₂O₅ and 

e) Cl₂O₇
the most basic, most acidic and amphoteric oxide can be

Alkali metal oxide is most basic: ${\mathrm{Na}}_2\mathrm{O}$

Aluminum oxide is amphoteric : ${\mathrm{Al}}_2{\mathrm{O}}_3$

Non metallic oxide is acidic: ${\mathrm{Cl}}_2{\mathrm{O}}_7$