MCQ
Sodium extract gives blood red colour when treated with $\ce{FeCl_3}$. Formation of blood red colour confirms the presence of:
- AOnly nitrogen
- BOnly sulphur
- COnly halogens
- ✓Both nitrogen and sulphur
✓
Answer
Correct option: D.
Both nitrogen and sulphur
$Na + N + C + S \rightarrow \text{NaSCN} ($Sodium thiocyanate$)$
$\mathrm{SCN}^{-}+\mathrm{Fe}^{+} \rightarrow[\mathrm{Fe}(\mathrm{SCN})]^{2+} ($Ferric thiocyanate$) ($Blood$-$red colour$)$
It confirms the presence of both $N$ and $S$.
$\mathrm{SCN}^{-}+\mathrm{Fe}^{+} \rightarrow[\mathrm{Fe}(\mathrm{SCN})]^{2+} ($Ferric thiocyanate$) ($Blood$-$red colour$)$
It confirms the presence of both $N$ and $S$.
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