Which one of the following complexes is violet in colour?

Question

Canvas Classes · Accepted Answer

Step 1: Identify the Colours of Each Complex

| Complex | Name | Colour |
|---|---|---|
|  | Pentacyanonitrosylferrate sulphide | Violet/Purple ✅ |
|  | Iron(II) thiocyanate | Blood red in +3 state |
|  | Prussian blue | Dark blue |
|  | Hexacyanoferrate(II) | Yellow/amber |

Step 2: Origin of the Violet Complex

is formed in the Lassaigne sulphur test:

When  ion from the sodium extract reacts with sodium nitroprusside , the sulphide ion replaces the oxygen in the NO ligand to form the violet

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