Which of the following is precipitated when an arsenate reacts with a magnesia mixture?

CHEMISTRY · Single correct · ISC · Chemistry · Equilibrium · Common ion effect

Problem

Which of the following is precipitated when an arsenate reacts with a magnesia mixture? (1) MgHAsO3\text{MgHAsO}_3 (2) Mg2AsO3\text{Mg}_2\text{AsO}_3 (3) MgNH4AsO4⋅6H2O\text{MgNH}_4\text{AsO}_4 \cdot 6\text{H}_2\text{O} (4) Mg2NH4AsO4⋅6H2O\text{Mg}_2\text{NH}_4\text{AsO}_4 \cdot 6\text{H}_2\text{O}

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