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(D) The test described is the Lassaigne's test for nitrogen. $1$. The sodium fusion extract contains sodium cyanide $(NaCN)$ if nitrogen is present in

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Nitrogen

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(D) The test described is the Lassaigne's test for nitrogen. $1$. The sodium fusion extract contains sodium cyanide $(NaCN)$ if nitrogen is present in the organic compound. $2$. When $NaCN$ reacts with iron$(II)$ sulphate $(FeSO_4)$,it forms sodium hexacyanoferrate$(II)$. $3$. Upon adding concentrated $H_2SO_4$,some $Fe^{2+}$ ions are oxidized to $Fe^{3+}$ ions. $4$. These $Fe^{3+}$ ions react with the hexacyanoferrate$(II)$ ions to form ferric ferrocyanide,$Fe_4[Fe(CN)_6]_3$,which is known as Prussian blue. $5$. Thus,the appearance of Prussian blue colour confirms the presence of nitrogen.

When sodium fusion extract of an organic compound is boiled with iron$(II)$ sulphate solution followed by addition of concentrated $H_2SO_4$,it gives a Prussian blue colour. This confirms the presence of which element?

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