Among $\mathrm{a}){\mathrm{Na}}_2\mathrm{O};\mathrm{b})\mathrm{MgO};\mathrm{c}){\mathrm{Al}}_2{\mathrm{O}}_3;\mathrm{d}){\mathrm{P}}_2{\mathrm{O}}_5\mathrm{and}\mathrm{e}){\mathrm{Cl}}_2{\mathrm{O}}_7$ the most basic, most acidic and amphoteric oxide can be 

• In a period from left to right metallic nature decreases so basic nature decreases.

      Most basic ---- Na₂O

    Most acidic ------Cl₂O₇

     Amphoteric ------Al₂O₃