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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)`
B. `CO_(3)^(2-)`
C. `NO_(3)^(-)`
D. `SO_(4)^(2-)`
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Correct Answer - A
`MgCl_(2) +2NaHCO_(3)rarr Mg(HCO_(3)) (aq)+2NaCl`
`Mg(HCO_(3))_(2)(aq) overset(Delta)rarr underset(("White ppt."))(MgCO_(3) uarr)+H_(2)O+CO_(2)darr.`
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