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To a solution of a salt, `MgSO_4` solution is added and white ppt. appears only on heating. The acid radical in the salt is
A. `CO_(3)^(2-)`
B. `HCO_(3)^(-)`
C. `SO_(3)^(2-)`
D. `C_(2)O_(4)^(2-)`

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`2NaHCO_(3)+MgSO_(4) to underset("Soluble")(Mg(HCO_(3))_(2))+H_(2)+CO_(2)`
`Mg(HCO_(3))_(2) overset(Delta)tounderset("White ppt.")(MgCO_(3) darr) +H_(2)O +CO_(2)`

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