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Question: Answered & Verified by Expert
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the presence of
Chemistryd and f Block ElementsCOMEDKCOMEDK 2020
Options:
  • A $\mathrm{S}$
  • B $\mathrm{N}$
  • C $\mathrm{N}$ and $\mathrm{S}$
  • D $\mathrm{S}$ and $\mathrm{Cl}$
Solution:
2456 Upvotes Verified Answer
The correct answer is: $\mathrm{N}$ and $\mathrm{S}$
Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration, which eonfirms the presence of $\mathrm{N}$ and $\mathrm{S}$.
$\mathrm{Na}+\mathrm{C}+\mathrm{N}+\mathrm{S} \longrightarrow \mathrm{NaCNS}$ (Sodium thiocyanate)
$\mathrm{Fe}^{3+}+3 \mathrm{CNS}^{-} \longrightarrow \mathrm{Fe}(\mathrm{CNS})_{3}$
Fes pet.

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