1.

Mg is not precipitated in group V because

Answer»

`MgCO_(3)` is soluble in water
`MgCO_(3)` is soluble in `NH_(4)Cl`
`MgCO_(3)` is soluble in `NH_(4)OH`
NONE

Solution :The concentration of `CO_(3)^(2-)` ions is very LOW which does not prevent the ionic product of `Mg^(2+)` and `CO_(3)^(2-)` ions to surpass the solubility product in the PRESENCE of `NH_(4)Cl`


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