1.

The presence of magnessium is confimed in the qualitative amalysis by the formation of a white crystaline precipitate of :

Answer»

`MG(HCO_(3))_(2)`
`MgNH_(4)PO_(4)`
`MgNH_(4)(HCO_(3))_(3)`
`MgCO_(3)`

Solution :`MgCI_(2) + Na_(2)HPO_(4) + NH_(4)OH rarr underset("White ppt")(Mg(NH_(4))PO_(4) +2NaCI +H_(2)O`


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