1.

The reactionof nitroprusside anion with sulphide ion gives purple colouration due to the formation ofA. The tetranionic complex of iron (II) coordinating to one `NOS^(-)` ionB. The dianionic complex of iron (II) coordinating to one `NOS^(-)` ionC. The trianionic complex of iron (III) coordinating to one `NOS^(-)` ionD. The tetranionic complex of iron (III) coordinating to one `NCS^(-)` ion

Answer» Correct Answer - A
`Na_(2)S + underset(" Sod. Nitroprusside")(Na_(2)[Fe(CN)_(5)NO]) rarr underset(" Violet colour")(Na_(4)[Fe(CN)_(5)NOS])`
`[Fe^(+2)(CN)_(5)^(-5)NOS]^(-4) rArr` Tetra anionic complex of iron
(II) co-ordinating to one `NOS^(-)` ion.


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