Question:

Violet coloured complex obtained in the detection of sulphur is

Updated On: Jun 23, 2023
  • $ Na_2[Fe(NO)(CN)_5] $
  • $ Na_{3}[Fe(ONS)(CN)_{5}] $
  • $ Na_{4}[Fe(CN)_{5}NOS] $
  • Both (b) and (c)
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The Correct Option is C

Solution and Explanation

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside. $Na_2S + \underset{\text{sodium nitroprusside}}{Na_2[Fe(CN)_5NO]} \rightarrow \underset{\text{sodium thionitroprusside}}{Na_4[Fe(CN)_5NOS]}$
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