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Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of
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$\mathrm{N}$ and $\mathrm{S}$
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $\mathrm{N}$ and $\mathrm{S}$
$$
3 \mathrm{NaCNS}+a q . \mathrm{FeCl}_{3} \longrightarrow \underset{\substack{\text { red } \\ \text { (ferric thiocyanide) }}}{\mathrm{Fe}(\mathrm{CNS})_{3}+3 \mathrm{NaCl}}
$$
$$
3 \mathrm{NaCNS}+a q . \mathrm{FeCl}_{3} \longrightarrow \underset{\substack{\text { red } \\ \text { (ferric thiocyanide) }}}{\mathrm{Fe}(\mathrm{CNS})_{3}+3 \mathrm{NaCl}}
$$
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