A sodium salt of unknown anion when treated with `MgCl_(2)` gives a white `ppt`. On boiling. The anion is

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

A soldium 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 precipitate only on boiling. The anion is

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

A sodium salt X of an unknown anion when treated with MgCI_(2) gives white precipitate Y only on boiling. It gives lime water test positve but doesn’t gives KMnO_(4) test. Compound X and Y can't be separately by using: