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A soldium salt of unknown anion when tre...

A soldium salt of unknown anion when treated with `MgCl_(2)` gives white precipitate only on boiling. The anion is:

A

`SO_(4)^(2-)`

B

`HCO_(3)^(Θ)`

C

`CO_(3)^(2-)`

D

`NO_(3)^(Θ)`

Text Solution

Verified by Experts

The correct Answer is:
b,c
It must be a bicarbonate ion because first magnesium beicarbonate is formed which is soluble , then on heating , magnesium carbonate is formed which is a insoluble and forms a precipitate
`MgCI_(2) + 2NaHCO_(3) rarr underset("soluble")((Mg(HCO_(3))_(2)) + 2NaCI`
`Mg(HCO_(3))_(2) overset(Delta)(to) underset(white)(MgCO_(3) darr) + H_(2)o + co_(2)`
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