Single Choice

$$\begin{matrix}Na_2S&+&X&\longrightarrow& Na_2[Fe(CN)_5(NOS)]\\&&&&purple\:color\end{matrix}$$ Find the value of magnetic moment of X.

A0
Correct Answer
B1
C-1
D2

Solution

With sodium nitrprusside solution, ionic sulphide gives a purple colour in alkaline medium.

$$Na_2S + Na_2[Fe(CN)_5NO] \longrightarrow Na_4[Fe(CN)_5NOS]$$
$$Purple\ colour$$

Here X is,
$$Na_2[Fe(CN)_5(NO)]$$
+2 +1
$$\Rightarrow Fe^{+2} = d^6$$ , due to strong ligand pairing happens and low spin complex forms as shown in the figure.
So, it have zero unpaired electron and zero magnetic moment.
Hence, the correct option is A.

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