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In fifth group, (NH(4))(2)CO(3) is added...

In fifth group, `(NH_(4))_(2)CO_(3)` is added to precipitate out the carbonates. We do not add `Na_(2)CO_(3)` because:

A

`CaCO_(3)` is soluble in `Na_(2)CO_(3)`

B

`Na_(2)CO_(3)` increases the solubility of fifth group carbonates.

C

`MgCO_(3)` will be precipitated out in fifth group.

D

None of these

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