The reaction of nitroprusside anion with sulphide ion gives purple colouration due to the formation of:
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
A
the dianionic complex of iron (II) coordinating to one NCS− ion
B
the tetranionic 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 NCS− ion
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Solution
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Na2S+Na2[Fe(CN)5NO]sodiumnitropruside⟶Na4[Fe(CN)5NOS]purplecolour Na4[Fe(CN)5NOS]⇌4Na++[Fe(CN)5NOS]4− tetra anionic complex of iron (III) coordinating to one NOS− ions.
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