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A sodium salt of unknown anion when trea...

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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