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

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A sodium salt of unknown anion when treated with `MgCl_(2)` gives a white `ppt`. On boiling. The anion is
A. `HCO_(3)^(o.)`
B. `CO_(3)^(2-)`
C. `SO_(4)^(2-)`
D. `NO_(3)^(o.)`
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