\( \mathrm{MgSO}_{4} \) on reaction with \( \mathrm{NH}_{4} \mathrm{OH} \) and \( \mathrm{Na}_{2...

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\( \mathrm{MgSO}_{4} \) on reaction with \( \mathrm{NH}_{4} \mathrm{OH} \) and \( \mathrm{Na}_{2} \mathrm{HPO}_{4} \) forms a white crystalline precipitate. What is its formula?
(a) \( \mathrm{Mg}\left(\mathrm{NH}_{4}\right) \mathrm{PO}_{4} \)
(b) \( \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2} \)
(c) \( \mathrm{MgCl}_{2} \cdot \mathrm{MgSO}_{4} \)
(d) \( \mathrm{MgSO}_{4} \)
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