Question

Sodium extract gives blood red colour when treated with $FeC{l}_3$. Formation of blood red colour confirms the presence of:

• A. only nitrogen
• B. only sulphur
• C. only halogens
• D. both nitrogen and sulphur

Answer 1

The correct option is D both nitrogen and sulphur

$Na+N+C+S\to NaSCN$
Sodium thiocyanate
$SC{N}^{-}+F{e}^{3+}\to \left[Fe\right(SCN){]}^{+2}$
Ferric thiocyanate (Blood-red colour)
It confirms the presence of both $N$ and $S$.