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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)^(Θ)`
B. `CO_(3)^(2-)`
C. `SO_(4)^(2-)`
D. `NO_(3)^(Θ)`
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Correct Answer - A
Bicarbonates on heating form insoluble carbonates.
`MgCl_(2)+2NaHCO_(3)rarr2NaCl+Mg(HCO_(3))_(2)`
`Mg(HCO_(3))_(2)overset(Delta)(rarr)Mg CO_(3)darr.+H_(2)O+CO_(2)`
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