MCQ
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration. This confirms the presence of which of the following element $(s)\ ?$
- ABoth $S$ and $cl.$
- ✓Both $N$ and $S.$
- COnly $N$.
- DOnly $S.$
✓
Answer
Correct option: B.
Both $N$ and $S.$
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which confirms the presence of $N$ and $S$ both.
$\text{Na} + \text{C} + \text{N} + \text{S} \xrightarrow{\ \ \ \ \ \ } \text{NaSCN}$
$\text{Fe}^{+3} + \text{SCN}^{-} \xrightarrow{\ \ \ \ \ \ } [\text{Fe}(\text{SCN})]^{2+}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Blood red}$
$\text{Na} + \text{C} + \text{N} + \text{S} \xrightarrow{\ \ \ \ \ \ } \text{NaSCN}$
$\text{Fe}^{+3} + \text{SCN}^{-} \xrightarrow{\ \ \ \ \ \ } [\text{Fe}(\text{SCN})]^{2+}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Blood red}$
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