The Lassaigne's test relies on forming Prussian blue to confirm the presence of Nitrogen in an organ — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

The chemical formula for the Prussian blue complex is iron(III) hexacyanidoferrate(II), written as $Fe_4[Fe(CN)_6]_3$. In this formula, there are $4$ iron atoms outside the coordination sphere and $3$ iron atoms inside the square brackets. Total Iron atoms = $4 + 3 = 7$.