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JEE Main202126 Aug 2021Morning ShiftChemistryCoordination CompoundsActual

Which one of the following complexes is violet in colour?

Options

  1. AFe 4 Fe ( CN ) 6 3 · H 2 O
  2. BFe ( CN ) 5 NOS 4 -
  3. CFe ( SCN ) 6 4 -
  4. DFe ( CN ) 6 4 -

Correct answer

B. Fe ( CN ) 5 NOS 4 -

Step-by-step solution

Sulphur of organic compounds is detected by using sodium nitroprusside. With it sulphur forms a violet colour complex, called sodium thionitroprusside. S 2 - + Na 2 Fe ( CN ) 5 ( NO ) + Sodium   nitroprusside → Na 4 Fe ( CN ) 5 ( NOS ) Violet   colour

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