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JEE Main20211 Sep 2021Evening ShiftChemistryGeneral Organic ChemistryActual

The potassium ferrocyanide solution gives a Prussian blue colour, when added to :

Options

  1. ACoCl 3
  2. BCoCl 2
  3. CFeCl 2
  4. DFeCl 3

Correct answer

D. FeCl 3

Step-by-step solution

6 NaCN + FeSO 4 ⟶ Na 4 Fe ( CN ) 6 Na 4 Fe ( CN ) 6 + 4 Fe 3 + ⟶ xH 2 O Fe 4 Fe ( CN ) 6 3 . xH 2 O Ferric   ferrocyanide   ( Prussian   blue   complex )

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