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`MgSO_(4) +NH_(4)OH + Na_(2)HPO_(4) to` white crystalline precipitate.The formula of crystalline precipitate is:
A. `MgCl_(2).MgSO_(4)`
B. `MgSO_(4)`
C. `Mg(NH_(4))PO_(4)`
D. `Mg(PO_(4))_(2)`

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Correct Answer - C
`MgSO_(4)` on reaction with `Na_(2)HPO_(4)` in presence of `NH_(4)OH` gives white precipitate of `Mg(NH_(4))PO_(4)`
`MgSO_(4)+Na_(2)HPO_(4) + NH_(4)OH to Mg(NH_(4))PO_(4)darr+Na_(2)SO_(4)+H_(2)O`

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