Nitric acid attacks all the metals except noble metals but the nature of products of same metal along with corresponding nitrates depends upon the concentration of `HNO_3`. Explain.

Explanation

In conc. `HNO_3`, more number of `NO_3` ions are present per unit volume, these `NO_3` ions acts as oxidizinga gent. It gets reduced to `NO_2` duet to , more production of oxygen. In casoef dilute `HNO_3` less number of `NO_3^+ ` Ions are present. So It gets reduced to mtrlc oxide