KCET · Chemistry · General Organic Chemistry
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of
- A \(\mathrm{S}\) and \(\mathrm{Cl}\)
- B \(\mathrm{N}\) and \(\mathrm{S}\)
- C \(\mathrm{N}\)
- D \(\mathrm{S}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{N}\) and \(\mathrm{S}\)
Step-by-step Solution
Detailed explanation
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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