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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

`CO_(3)^(2-)`

B

`HCO_(3)^(Θ)`

C

`SO_(4)^(2+)`

D

`NO_(3)^(Θ)`

Text Solution

Verified by Experts

The correct Answer is:
B
Given, `NaX+MgCl_(2)overset(Delta)(rarr)`White ppt.
`NaHCO_(3)+MgCl_(2)rarrunderset("Soluble")(Mg(HCO_(3))_(2))+NaCl`
`Mg(HCO_(3))_(2)overset(Delta)(rarr)underset("White ppt".)(MgCO_(3))+H_(2)O+Co_(2)`
Hence, anion of the sodium salt is `HCO_(3)^(Θ)`.
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