Which one of the following complexes is violet in colour?

Which one of the following complexes is violet in colour?
  1. Fe4Fe(CN)63·H2O
  2. Fe(CN)5NOS4-
  3. Fe(SCN)64-
  4. Fe(CN)64-

Solution

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside.

S2-+Na2Fe(CN)5(NO)+Sodium nitroprusside→Na4Fe(CN)5(NOS)Violet colour

Asked in: JEE Main 2021 (26 Aug Shift 1)

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