The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline…

The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline precipitate of
  1. $\mathrm{Mg}\left(\mathrm{HCO}_{3}ight)_{2}$
  2. $\mathrm{MgNH}_{4} \mathrm{PO}_{4}$
  3. $\mathrm{MgNH}_{4}\left(\mathrm{HCO}_{3}ight)_{3}$
  4. $\mathrm{MgCO}_{3}$

Solution

$\begin{aligned} \mathrm{MgCl}_{2}+\mathrm{Na}_{2} \mathrm{HPO}_{4}+\mathrm{NH}_{4} \mathrm{OH} ightarrow \\ & \mathrm{Mg}\left(\mathrm{NH}_{4}ight) \mathrm{PO}_{4}(white ppt)+2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O} \end{aligned}$ *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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