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  4. Freshly prepared solution of sodium nitroprusside is added to the sodium extract. Appearance of a deep violet colour indicates the presence of

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Q. Freshly prepared solution of sodium nitroprusside is added to the sodium extract. Appearance of a deep violet colour indicates the presence of

Organic Chemistry – Some Basic Principles and Techniques

Solution:

$Na_{2}S+Na_{2} \underset{\text{sod. nitroprusside}}{{[Fe(CN)_{5}(NO)]}} \to \underset{\text{sod. thionitroprusside (Violet)}}{{Na_{4}[Fe(CN)_{5}(NOS)}}$