A sodium salt of unknown anion when treated with MgCl_(2)gives white precipitate only on boiling. The anion is ..........

A sodium salt of unknown anion when treated with MgCl_(2)gives white p

1.	A sodium salt of unknown anion when treated with MgCl_(2)gives white precipitate only on boiling. The anion is ..........
Answer» `SO_(4)^(2-)` `HCO_(3)^(-)` `CO_(3)^(2-)` `NO_(3)^(-)` ANSWER :B