Question

To show that metals react with oxygen to form mettalic which are basic in nature

Answer 1

LETS TAKE ONE EXAMPLE

Na + O2 gives Na2O .

Na2O +H2SO4 gives Na2SO4 and H2O

Here  Na2SO4 is salt .

H2SO4 is a acid.

And that Neutralisation reaction so Na2O IS Basic in nature.

Answer 2

2Na + O2 --> 2NaO
2NaO + H2 --> 2NaOH
NaOH is a base hence metal react with oxygen to form base