1.

Na_(2)CO_(3) cannot be used to identify

Answer»

`CO_(3)^(2-)`
`SO_(3)^(2-)`
`S^(2-)`
`SO_(4)^(2-)`

SOLUTION :`SO_(3)^(2-),S^(2-)` and `SO_(4)^(2-)` SALTS form comparatively stronger acids (than `H_(2)CO_(3)`) in solution HENCE evolve `CO_(2)` with `Na_(2)CO_(3)` solution and GIVE effervesence. While `CO_(3)^(2-)` does not react with `Na_(2)CO_(3)` solution.


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