1.

Na_(2)CO_(3) cannot be used in place of (NH_(4))_(2)CO_(3) for the precipitate of group V because

Answer»

`NA^(o+)`interferes in the detertion of group V
Cancentration of `CO_(3)^(2-)` is very low
Na will REACTS with acid redicals
Mg` will be PRECIPITATE

Solution :`Na_(2)CO_(3)` fermishes appreciable `p[CO_(3)^(2-)]` to precipitate `Mg`


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