The reaction of nitroprusside anion with sul- phide ion gives purple colouration due to the formation of

Options

A. The tetranionic complex of iron (II) coordinating to one `NOS^(-)` ion.
B. The dianionic complex of iron (II) coordinating to one `NOS^(-)` ion
C. The trianionic complex of iron (III) coordinating to one `NOS^(-)` ion.
D. The tetranionic complex of iron (III) coordinating to one `NOS^(-)` ion.

Answer

A

Explanation

`underset("Sod. Nitroprusside")(Na_(2)S + Na_(2)[Fe(CN)_(5)NO]) to 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.