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

Question:

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

  1. $\mathrm{CoCl}_{3}$

  2. $\mathrm{FeCl}_{2}$

  3. $\mathrm{CoCl}_{2}$

  4. $\mathrm{FeCl}_{3}$


Correct Option: , 4

Solution:

$\mathrm{FeCl}_{3}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \rightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$

Prussian blue

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