The formula of the purple colour formed in Lassaigne's test for sulphur using sodium nitroprusside is

Question

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Step 1: Recall the Sulphur Test in Lassaigne's Test

In Lassaigne's test for sulphur:
1. Organic compound is fused with Na →  forms
2. The sodium extract is treated with sodium nitroprusside 
3. The  from  reacts with the nitroprusside complex

Step 2: The Reaction

The product is sodium pentacyanonitrosylferrate(II) thiocomplex:

This complex has violet/purple colour.

Step 3: Evaluate the Options

(a)  — This is related to Prussian blue (nitrogen test), not sulphur test → ❌

(b)  — This is

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