Sodium nitroprusside when added to an alkaline solution of sulphide ions produces purple coloration due to the formation of :

N a_{4} [F e {(S C N)}_{5} N O S]

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N a_{3} [F e {(C N)}_{5} N O S]

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N a_{2} [F e {(C N)}_{5} N O S]

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N a_{4} [F e {(C N)}_{5} N O S]

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Solution

The correct option is A $N a_{4} [F e {(C N)}_{5} N O S]$
Sodium nitroprusside when added to an alkaline solution of sulphide ions produces purple coloration due to the formation of $N a_{4} [F e {(C N)}_{5} N O S]$ .

$\begin{matrix} N a_{2} [F e {(C N)}_{5} N O] & + & N a_{2} S & ⟶ & N a_{4} [F e {(C N)}_{5} N O S] S o d i u m n i t r o p r u s s i d e & S o d i u m t h i o n i t r o p r u s s i d e (P u r p l e) \end{matrix}$ .

Hence,option D is correct.

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