A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`

A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`
A. `HCO_(3)^(-)`
B. `CO_(3)^(2-)`
C. `NO_(3)^(-)`
D. `SO_(4)^(2-)`

A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`

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