1.

For the precipitation group IV metal ions as their insoluble carbonates, a saturated (NH_(4))_(2)CO_(3) solution is added as a group reagent. But Na_(2)CO_(3) or K_(2)CO_(3) should not be used as the group reagent because

Answer»

They will prevent the precipitation of group IV metal CARBONATES by forming soluble complex salts.
The presence or absence of `Na^(+)` or `K^(+)` in the original salt MIXTURE can not be ASCERTAINED in group V tests.
These will make the solution highly ALKALINE due to hydrolysis and will prevent the precipitation of group IV metal ions.
They will precipitate out `Mg^(2+)` ion of group V(if present) along with group IV metal carbonates .

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