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Mg is not precipitated in group V because

(a) $MgCO_3$ is soluble in water
(b) $MgCO_3$ is soluble in $NH_4Cl$
(c) $MgCO_3$ is soluble in $NH_4OH$
(d) None of these
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Answer: None of these
The concentration of $CO^{2-}$ ions is very low which does not prevent the ionic product of $Mg^{2+}$ and $CO^{2-}_3$ ions to surpass the solubility product in the presence of $NH_4Cl$.
answered Feb 1, 2014 by mosymeow_1
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