1.

Blue coloured compound are obtained when

Answer»

`Fe^(2+)` ion REACT with potassium ferriyanide
`Fe^(3+)` ion react with potassium FERROCYANIDE
`Fe^(3+)` ion react with potassium ferriyanide
`Fe^(2+)` ion react with potassium ferroyanide

Answer :a,B


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