PO4
yellow ppt
C2O4
disappearance of pink color
SO4
white ppt
CrO4
yellow ppt
ClO3
white ppt
BO3
green bordered flame
NO2
vigorous evolution of gas
NO3 H2SO4 a-naphthylamine
purple ring
NO3 FeSO4, H2SO4
brown ring
(NH4)2MoO4
Ammonium molybdate