The brilliant Prussian blue coloration obtained in Lassaigne's test for nitrogen is due to the forma — Practical Organic Chemistry and Purification Chemistry Question

💡 Solution & Explanation

The cyanide ions react to form hexacyanoferrate(II), which upon addition of $Fe^{3+}$ yields Iron(III) hexacyanoferrate(II), $Fe_4[Fe(CN)_6]_3$, known as Prussian blue.