Question

A sodium salt on treatment with `MgCl_(2)` gives white precipitate only on heating. The anion of the sodium salt is `:`
A. `HCO_(3)^(-)`
B. `CO_(3)^(2-)`
C. `NO_(3)^(-)`
D. `SO_(4)^(2-)`

Answer 1

Correct Answer - 1
`Mg^(2+)+2HCO_(2)^(-)("from sodium salt")rarrMg(HCO_(3))_(2)("soluble")overset(Delta)rarrMgCO_(3)darr("while")+H_(2)O+CO_(2)`