The reaction of nitroprusside anion with sulp | vedclass

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(A) The reaction between sodium nitroprusside $(Na_2[Fe(CN)_5NO])$ and sulphide ion $(S^{2-})$ is a standard test for the detection of sulphur.The rea

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the tetranionic complex of iron $(II)$ coordinating to one $NOS^{4-}$ ion

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(A) The reaction between sodium nitroprusside $(Na_2[Fe(CN)_5NO])$ and sulphide ion $(S^{2-})$ is a standard test for the detection of sulphur.The reaction is as follows:$Na_2S + Na_2[Fe(CN)_5NO] \rightarrow Na_4[Fe(CN)_5NOS]$This complex dissociates in solution as:$Na_4[Fe(CN)_5NOS] \rightleftharpoons 4Na^+ + [Fe(CN)_5NOS]^{4-}$The resulting complex $[Fe(CN)_5NOS]^{4-}$ is a tetranionic complex of iron $(II)$ where the $NO^+$ ligand is replaced by $NOS^{3-}$ (or effectively coordinates as $NOS^{3-}$ to the $Fe^{2+}$ center), resulting in a deep purple colouration.

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

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