Appearance of blood red colour,on treatment o | vedclass

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Question

(C) The sodium fusion extract contains $NaCN$ and $Na_2S$ if both nitrogen and sulphur are present in the organic compound.These react to form sodium

Vedclass · Accepted Answer

$N$ and $S$

Vedclass · Answer

(C) The sodium fusion extract contains $NaCN$ and $Na_2S$ if both nitrogen and sulphur are present in the organic compound.These react to form sodium thiocyanate: $Na^{+} + CN^{-} + S^{2-} \rightarrow NaSCN$.In the presence of $Fe^{3+}$ ions (formed by the oxidation of $Fe^{2+}$ by concentrated $H_2SO_4$),the thiocyanate ion forms a blood-red complex: $Fe^{3+} + SCN^{-} \rightarrow [Fe(SCN)]^{2+}$.Thus,the appearance of a blood-red colour confirms the presence of both $N$ and $S$.

Appearance of blood red colour,on treatment of the sodium fusion extract of an organic compound with $FeSO_4$ in presence of concentrated $H_2SO_4$ indicates the presence of element/s

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