The composition of species showing purple colour in the test of $\mathrm{S}$ when sodium nitroprusside is…

The composition of species showing purple colour in the test of $\mathrm{S}$ when sodium nitroprusside is added to the Lassaigne solution is
  1. $\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NO}ight]^{2-}$
  2. $\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}ight]^{4}$
  3. $\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NO}) \mathrm{S}ight]^{2-}$
  4. $\left[\mathrm{Fe}(\mathrm{CN})_{4} \mathrm{NOS}ight]^{3-}$

Solution

The appearance of a deep violet color upon addition of a few drops of sodium nitroprusside to SFE indicates the presence of sulfur.
Detection of sulfur: formation of violet color with nitroprusside

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more PRACTICAL CHEMISTRY questions on Aicharya