A sodium salt of an 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. `SO_(4)^(2-)`
B. `HCO_(3)^(-)`
C. `CO_(3)^(2-)`
D. `NO_(3)^(-)`

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

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