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A solution of sodium salt of unknown anion when treated with Magnesium chloride solution gives white precipitate only on boiling. The anion is

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A solution of sodium salt of unknown anion when treated with Magnesium chloride solution gives white precipitate only on boiling. The anion is
A. `SO_(4)^(2-)`
B. `HCO_(3)^(-)`
C. `CO_(3)^(2-)`
D. `NO_(3)^(-)`.
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Correct Answer - B
Bicarbonates on heating form insoluble carbonates
`MgCl_(2) + 2NaHCO_(3)rarr2NaCl+Mg (HCO_(3))_(2)`
`Mg(HCO_(3))_(2)overset(Delta)rarrMgCO_(3)darr+CO_(2)+H_(2)O`
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