The reaction with BaCl2 to give white ppt indicates the presence of sulphate group. The reaction with Nesslers reagent is due to the presence of ammonium ion group. Finally the blue color complex formed due to the formation of Turns bull ( ${[F e {(C N)}_{6}]}^{- 3} + F e^{+ 2}$ )

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The reaction with BaCl2 to give white ppt indicates the presence of sulphate group. The reaction with Nesslers reagent is due to the presence of ammonium ion group. Finally the blue color complex formed due to the formation of Turns bull (Fe(CN)6-3+ Fe+2)