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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)`

B

`CO_(3)^(2-)`

C

`NO_(3)^(-)`

D

`SO_(4)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
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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