1.

The reaction of nitroprusside anion with sulphide ion gives purple colouration due to the formation of

Answer»

the tetranionic complex of IRON (II) coordinating to ONE `NOS^(-)` ION
the dianionic complex of iron (II) coordinating to one `NCS^(-)` ion
the trianionic complex of iron (III) coordinating to one `NOS^(-)` ion
the tetranionic complex of iron (III) coordinating to one `NCS^(-)` ion

Solution :`Na_2 S + underset("Sod. Nitroprusside")(Na_(2) [Fe(CN)_(5))NO] to Na_(4) underset("Violet COLOUR")([Fe(CN)_(5) ) NOS]`
`[overset(+2)(Fe) (C overset(-5)(N))_(5) NOS]^(-4) implies` Tetra-anionic complex of iron (II) coordinating to one `NOS^(-)` ion.


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