On heating the salt with HNO3 and ammonium molybdate, formation of yellow ppt indicates the presence of AsO3−4 or PO3−4.
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Solution
On heating the salt with HNO3 and ammonium molybdate, formation of yellow ppt indicates the presence of AsO3−4 or PO3−4 Ba3(PO4)2+6HNO3→3Ba(NO3)2+2H3PO4
H3PO4+12(NH4)2.MoO4+21HNO3→(NH4)3PO4.12MoO3↓+12H2O+21NH4NO3(Ammoniumphosphomolybdate,yellowppt) Same reaction is also given by arsenate anion.