`MgSO_(4)` on reaction with `NH_(4)OH` and `Na_(2)HPO_(4)` forms a white crystalline precipitate. What is its formula ?
A. `Mg(NH_(4))PO_(4)`
B. `Mg_(3)(PO_(4))_(2)`
C. `MgCl_(2).MgSO_(4)`
D. `MgSO_(4)`

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Correct Answer - 1
`MgSO_(4)+NH_(4)OH+Na_(2)HPO_(4)rarrunderset("White ppt")(Mg(NH_(4))PO_(4)darr)+Na_(2)SO_(4)+H_(2)O`

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