The sodium extract prepared from sulphanilic acid, contains $\mathrm{SCN}^{-}$. It gives blood red…

The sodium extract prepared from sulphanilic acid, contains $\mathrm{SCN}^{-}$. It gives blood red colouration with
  1. a mixture of $\mathrm{Na}_{2} \mathrm{~S}$ and $\mathrm{CS}_{2}$
  2. $\mathrm{FeCl}_{3}$
  3. $\mathrm{FeSO}_{4}$
  4. $\mathrm{Na}_{2} \mathrm{SO}_{3}$

Solution

$\mathrm{SCN}^{-}+\mathrm{Fe}^{3+} \longrightarrow \mathrm{Fe}(\mathrm{SCN})_{3}(blood red ppt)$ ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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