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Question: Answered & Verified by Expert
$\mathrm{MgSO}_4$ on reaction with $\mathrm{NH}_4 \mathrm{OH}$ and $\mathrm{Na}_2 \mathrm{HPO}_4$ forms a white crystalline precipitate. What is its formula?
Chemistrys Block ElementsJEE AdvancedJEE Advanced 2006
Options:
  • 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
    $\mathrm{MgSO}_4$
Solution:
1078 Upvotes Verified Answer
The correct answers are:
$\mathrm{Mg}\left(\mathrm{NH}_4\right) \mathrm{PO}_4$
$\mathrm{MgSO}_4$ on reaction with $\mathrm{Na}_2 \mathrm{HPO}_4$ (disodium hydrogen phosphate) in presence of $\mathrm{NH}_4 \mathrm{OH}$ to give white precipitate of magnesium ammonium phosphate $\left(\mathrm{Mg}\left(\mathrm{NH}_4\right) \mathrm{PO}_4\right)$.

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